{"title":"4\" \u0026 5\" Media Filters","description":"","products":[{"product_id":"12x24x4-merv-10","title":"12x24x4 MERV 10 Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 MERV 10 pleated air filter delivers allergy \u0026amp; pet defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures pet dander, mold spores, and fine allergens\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 10 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 10 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635953901810,"sku":"12x24x4M10-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635953934578,"sku":"12x24x4M10-2","price":48.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-10.jpg?v=1780790599"},{"product_id":"12x24x4-merv-12","title":"12x24x4 MERV 12 Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 MERV 12 pleated air filter delivers allergy \u0026amp; pet defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures pet dander, mold spores, and fine allergens\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 12 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 12 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635954000114,"sku":"12x24x4M12-1","price":35.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635954032882,"sku":"12x24x4M12-2","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-12.jpg?v=1780790599"},{"product_id":"12x24x4-merv-13-plus-carbon","title":"12x24x4 MERV 13 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 13 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 13 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635954098418,"sku":"12x24x4M13+C-1","price":44.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635954131186,"sku":"12x24x4M13+C-2","price":65.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-13-plus-carbon.jpg?v=1780790599"},{"product_id":"12x24x4-merv-13","title":"12x24x4 MERV 13 Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 MERV 13 pleated air filter delivers maximum protection for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures smoke, bacteria, virus carriers, and wildfire particulates\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 13 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 13 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635954196722,"sku":"12x24x4M13-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635954229490,"sku":"12x24x4M13-2","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-13.jpg?v=1780790600"},{"product_id":"12x24x4-merv-14-plus-carbon","title":"12x24x4 MERV 14 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 14 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 14 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635954295026,"sku":"12x24x4M14+C-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635954327794,"sku":"12x24x4M14+C-2","price":88.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-14-plus-carbon.jpg?v=1780790599"},{"product_id":"12x24x4-merv-14","title":"12x24x4 MERV 14 Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 MERV 14 pleated air filter delivers maximum protection for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures smoke, bacteria, virus carriers, and wildfire particulates\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 14 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 14 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635954393330,"sku":"12x24x4M14-1","price":46.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635954426098,"sku":"12x24x4M14-2","price":76.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-14.jpg?v=1780790600"},{"product_id":"12x24x4-merv-15-plus-carbon","title":"12x24x4 MERV 15 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 15 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 15 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635954491634,"sku":"12x24x4M15+C-1","price":55.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635954524402,"sku":"12x24x4M15+C-2","price":95.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-15-plus-carbon.jpg?v=1780790600"},{"product_id":"12x24x4-merv-15","title":"12x24x4 MERV 15 Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 MERV 15 pleated air filter delivers maximum protection for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures smoke, bacteria, virus carriers, and wildfire particulates\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 15 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 15 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635956064498,"sku":"12x24x4M15-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635956097266,"sku":"12x24x4M15-2","price":82.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-15.jpg?v=1780790600"},{"product_id":"12x24x4-merv-7-plus-carbon","title":"12x24x4 MERV 7 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 7 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 7 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635956162802,"sku":"12x24x4M7+C-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635956195570,"sku":"12x24x4M7+C-2","price":55.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-7-plus-carbon.jpg?v=1780790600"},{"product_id":"12x24x4-merv-7","title":"12x24x4 MERV 7 Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 MERV 7 pleated air filter delivers everyday defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures dust, lint, pollen, and dust mites\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 7 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 7 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635957735666,"sku":"12x24x4M7-1","price":32.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635957768434,"sku":"12x24x4M7-2","price":47.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-7.jpg?v=1780790600"},{"product_id":"12x24x4-merv-8","title":"12x24x4 MERV 8 Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 MERV 8 pleated air filter delivers everyday defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures dust, lint, pollen, and dust mites\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 8 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 8 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635957866738,"sku":"12x24x4M8-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635957899506,"sku":"12x24x4M8-2","price":48.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-8.jpg?v=1780790600"},{"product_id":"12x24x4-merv-8-pure-carbon","title":"12x24x4 MERV 8 Pure Carbon Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 8 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 8 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635957965042,"sku":"12x24x4PCP-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635957997810,"sku":"12x24x4PCP-2","price":72.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-8-pure-carbon.jpg?v=1780790600"},{"product_id":"12x24x4-merv-10-p-plus-carbon","title":"12x24x4 MERV 10 P + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 10 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 10 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635959537906,"sku":"12x24x4PM10C-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635959570674,"sku":"12x24x4PM10C-2","price":57.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-10-p-plus-carbon.jpg?v=1780790599"},{"product_id":"12x24x4-merv-12-p-plus-carbon","title":"12x24x4 MERV 12 P + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 12 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 12 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635959701746,"sku":"12x24x4PM12C-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635959734514,"sku":"12x24x4PM12C-2","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-12-p-plus-carbon.jpg?v=1780790600"},{"product_id":"12x24x4-merv-8-p-plus-carbon","title":"12x24x4 MERV 8 P + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 12x24x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 12x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/12x24x4-air-filters\"\u003eAll 12x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 12x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 8 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 12x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 12x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 8 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49635959931122,"sku":"12x24x4PM8C-1","price":37.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49635959963890,"sku":"12x24x4PM8C-2","price":53.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/12x24x4-merv-8-p-plus-carbon.jpg?v=1780790599"},{"product_id":"14x14x4-merv-10","title":"14x14x4 MERV 10 Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 MERV 10 pleated air filter delivers allergy \u0026amp; pet defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures pet dander, mold spores, and fine allergens\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 10 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 10 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636003840242,"sku":"14x14x4M10-1","price":35.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636003873010,"sku":"14x14x4M10-2","price":57.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-10.jpg?v=1780790600"},{"product_id":"14x14x4-merv-12","title":"14x14x4 MERV 12 Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 MERV 12 pleated air filter delivers allergy \u0026amp; pet defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures pet dander, mold spores, and fine allergens\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 12 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 12 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636004069618,"sku":"14x14x4M12-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636004102386,"sku":"14x14x4M12-2","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-12.jpg?v=1780790600"},{"product_id":"14x14x4-merv-13-plus-carbon","title":"14x14x4 MERV 13 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 13 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 13 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636005609714,"sku":"14x14x4M13+C-1","price":51.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636005642482,"sku":"14x14x4M13+C-2","price":83.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-13-plus-carbon.jpg?v=1780790600"},{"product_id":"14x14x4-merv-13","title":"14x14x4 MERV 13 Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 MERV 13 pleated air filter delivers maximum protection for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures smoke, bacteria, virus carriers, and wildfire particulates\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 13 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 13 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636005675250,"sku":"14x14x4M13-1","price":46.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636005708018,"sku":"14x14x4M13-2","price":75.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-13.jpg?v=1780790600"},{"product_id":"14x14x4-merv-14-plus-carbon","title":"14x14x4 MERV 14 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 14 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 14 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636005740786,"sku":"14x14x4M14+C-1","price":54.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636005773554,"sku":"14x14x4M14+C-2","price":89.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-14-plus-carbon.jpg?v=1780790600"},{"product_id":"14x14x4-merv-14","title":"14x14x4 MERV 14 Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 MERV 14 pleated air filter delivers maximum protection for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures smoke, bacteria, virus carriers, and wildfire particulates\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 14 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 14 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636005806322,"sku":"14x14x4M14-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636005839090,"sku":"14x14x4M14-2","price":81.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-14.jpg?v=1780790600"},{"product_id":"14x14x4-merv-15-plus-carbon","title":"14x14x4 MERV 15 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 15 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 15 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636007346418,"sku":"14x14x4M15+C-1","price":72.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636007379186,"sku":"14x14x4M15+C-2","price":139.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-15-plus-carbon.jpg?v=1780790600"},{"product_id":"14x14x4-merv-15","title":"14x14x4 MERV 15 Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 MERV 15 pleated air filter delivers maximum protection for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures smoke, bacteria, virus carriers, and wildfire particulates\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 15 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 15 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636007411954,"sku":"14x14x4M15-1","price":65.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636007444722,"sku":"14x14x4M15-2","price":120.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-15.jpg?v=1780790600"},{"product_id":"14x14x4-merv-7-plus-carbon","title":"14x14x4 MERV 7 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 7 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 7 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636007477490,"sku":"14x14x4M7+C-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636007510258,"sku":"14x14x4M7+C-2","price":65.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-7-plus-carbon.jpg?v=1780790600"},{"product_id":"14x14x4-merv-7","title":"14x14x4 MERV 7 Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 MERV 7 pleated air filter delivers everyday defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures dust, lint, pollen, and dust mites\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 7 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 7 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636007543026,"sku":"14x14x4M7-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636007575794,"sku":"14x14x4M7-2","price":50.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-7.jpg?v=1780790600"},{"product_id":"14x14x4-merv-8","title":"14x14x4 MERV 8 Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 MERV 8 pleated air filter delivers everyday defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures dust, lint, pollen, and dust mites\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 8 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 8 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636007608562,"sku":"14x14x4M8-1","price":32.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636007641330,"sku":"14x14x4M8-2","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-8.jpg?v=1780790600"},{"product_id":"14x14x4-merv-8-pure-carbon","title":"14x14x4 MERV 8 Pure Carbon Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 8 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 8 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636007837938,"sku":"14x14x4PCP-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636007870706,"sku":"14x14x4PCP-2","price":68.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-8-pure-carbon.jpg?v=1780790600"},{"product_id":"14x14x4-merv-10-p-plus-carbon","title":"14x14x4 MERV 10 P + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 10 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 10 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636007903474,"sku":"14x14x4PM10C-1","price":40.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636007936242,"sku":"14x14x4PM10C-2","price":70.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-10-p-plus-carbon.jpg?v=1780790600"},{"product_id":"14x14x4-merv-12-p-plus-carbon","title":"14x14x4 MERV 12 P + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 12 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 12 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636007969010,"sku":"14x14x4PM12C-1","price":44.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636008001778,"sku":"14x14x4PM12C-2","price":73.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-12-p-plus-carbon.jpg?v=1780790600"},{"product_id":"14x14x4-merv-8-p-plus-carbon","title":"14x14x4 MERV 8 P + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 14x14x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 14x14x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14x14x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/14x14x4-air-filters\"\u003eAll 14x14x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 14x14x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 8 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 14x14x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 14x14x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 8 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636009509106,"sku":"14x14x4PM8C-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636009541874,"sku":"14x14x4PM8C-2","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/14x14x4-merv-8-p-plus-carbon.jpg?v=1780790600"},{"product_id":"16x20x4-merv-10","title":"16x20x4 MERV 10 Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 MERV 10 pleated air filter delivers allergy \u0026amp; pet defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures pet dander, mold spores, and fine allergens\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 10 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 10 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636129341682,"sku":"16x20x4M10-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636129374450,"sku":"16x20x4M10-2","price":46.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-10.jpg?v=1780790640"},{"product_id":"16x20x4-merv-12","title":"16x20x4 MERV 12 Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 MERV 12 pleated air filter delivers allergy \u0026amp; pet defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures pet dander, mold spores, and fine allergens\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 12 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 12 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636129439986,"sku":"16x20x4M12-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636129472754,"sku":"16x20x4M12-2","price":47.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-12.jpg?v=1780790640"},{"product_id":"16x20x4-merv-13-plus-carbon","title":"16x20x4 MERV 13 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 13 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 13 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636129538290,"sku":"16x20x4M13+C-1","price":41.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636129571058,"sku":"16x20x4M13+C-2","price":71.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-13-plus-carbon.jpg?v=1780790640"},{"product_id":"16x20x4-merv-13","title":"16x20x4 MERV 13 Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 MERV 13 pleated air filter delivers maximum protection for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures smoke, bacteria, virus carriers, and wildfire particulates\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 13 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 13 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636129833202,"sku":"16x20x4M13-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636129865970,"sku":"16x20x4M13-2","price":62.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-13.jpg?v=1780790640"},{"product_id":"16x20x4-merv-14-plus-carbon","title":"16x20x4 MERV 14 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 14 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 14 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636129931506,"sku":"16x20x4M14+C-1","price":56.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636129964274,"sku":"16x20x4M14+C-2","price":96.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-14-plus-carbon.jpg?v=1780790639"},{"product_id":"16x20x4-merv-14","title":"16x20x4 MERV 14 Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 MERV 14 pleated air filter delivers maximum protection for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures smoke, bacteria, virus carriers, and wildfire particulates\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 14 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 14 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636130029810,"sku":"16x20x4M14-1","price":49.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636130062578,"sku":"16x20x4M14-2","price":84.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-14.jpg?v=1780790640"},{"product_id":"16x20x4-merv-15-plus-carbon","title":"16x20x4 MERV 15 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 15 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 15 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636130128114,"sku":"16x20x4M15+C-1","price":61.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636130160882,"sku":"16x20x4M15+C-2","price":105.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-15-plus-carbon.jpg?v=1780790640"},{"product_id":"16x20x4-merv-15","title":"16x20x4 MERV 15 Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 MERV 15 pleated air filter delivers maximum protection for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures smoke, bacteria, virus carriers, and wildfire particulates\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 15 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 15 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 15 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636130226418,"sku":"16x20x4M15-1","price":53.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636130259186,"sku":"16x20x4M15-2","price":92.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-15.jpg?v=1780790640"},{"product_id":"16x20x4-merv-7-plus-carbon","title":"16x20x4 MERV 7 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 7 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 7 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636130324722,"sku":"16x20x4M7+C-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636130357490,"sku":"16x20x4M7+C-2","price":52.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-7-plus-carbon.jpg?v=1780790640"},{"product_id":"16x20x4-merv-7","title":"16x20x4 MERV 7 Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 MERV 7 pleated air filter delivers everyday defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures dust, lint, pollen, and dust mites\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 7 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 7 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 7 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636130423026,"sku":"16x20x4M7-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636130455794,"sku":"16x20x4M7-2","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-7.jpg?v=1780790640"},{"product_id":"16x20x4-merv-8","title":"16x20x4 MERV 8 Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 MERV 8 pleated air filter delivers everyday defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures dust, lint, pollen, and dust mites\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 8 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 8 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636130521330,"sku":"16x20x4M8-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636130554098,"sku":"16x20x4M8-2","price":46.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-8.jpg?v=1780790640"},{"product_id":"16x20x4-merv-8-pure-carbon","title":"16x20x4 MERV 8 Pure Carbon Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 8 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 8 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636130619634,"sku":"16x20x4PCP-1","price":47.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636130652402,"sku":"16x20x4PCP-2","price":72.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-8-pure-carbon.jpg?v=1780790639"},{"product_id":"16x20x4-merv-10-p-plus-carbon","title":"16x20x4 MERV 10 P + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 10 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 10 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636130717938,"sku":"16x20x4PM10C-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636130750706,"sku":"16x20x4PM10C-2","price":55.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-10-p-plus-carbon.jpg?v=1780790639"},{"product_id":"16x20x4-merv-12-p-plus-carbon","title":"16x20x4 MERV 12 P + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 12 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 12 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636130816242,"sku":"16x20x4PM12C-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636130849010,"sku":"16x20x4PM12C-2","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-12-p-plus-carbon.jpg?v=1780790640"},{"product_id":"16x20x4-merv-8-p-plus-carbon","title":"16x20x4 MERV 8 P + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 16x20x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x20x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x20x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x20x4-air-filters\"\u003eAll 16x20x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x20x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 8 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x20x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x20x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 8 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 8 captures everyday dust, lint and pollen — solid baseline protection for homes without allergy concerns.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636130980082,"sku":"16x20x4PM8C-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636131012850,"sku":"16x20x4PM8C-2","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x20x4-merv-8-p-plus-carbon.jpg?v=1780790640"},{"product_id":"16x24x4-merv-10","title":"16x24x4 MERV 10 Air Filter","description":"\u003cp\u003eThe Ironside 16x24x4 MERV 10 pleated air filter delivers allergy \u0026amp; pet defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures pet dander, mold spores, and fine allergens\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x24x4-air-filters\"\u003eAll 16x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 10 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 10 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 10 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636139303154,"sku":"16x24x4M10-1","price":37.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636139335922,"sku":"16x24x4M10-2","price":53.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x24x4-merv-10.jpg?v=1780790665"},{"product_id":"16x24x4-merv-12","title":"16x24x4 MERV 12 Air Filter","description":"\u003cp\u003eThe Ironside 16x24x4 MERV 12 pleated air filter delivers allergy \u0026amp; pet defense for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures pet dander, mold spores, and fine allergens\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x24x4-air-filters\"\u003eAll 16x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 12 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 12 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 12 captures pet dander, mold spores, fine dust and pollen — the sweet spot for homes with pets or mild allergies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636139401458,"sku":"16x24x4M12-1","price":37.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636139434226,"sku":"16x24x4M12-2","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x24x4-merv-12.jpg?v=1780790665"},{"product_id":"16x24x4-merv-13-plus-carbon","title":"16x24x4 MERV 13 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 16x24x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x24x4-air-filters\"\u003eAll 16x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 13 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 13 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636139499762,"sku":"16x24x4M13+C-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636139532530,"sku":"16x24x4M13+C-2","price":71.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x24x4-merv-13-plus-carbon.jpg?v=1780790665"},{"product_id":"16x24x4-merv-13","title":"16x24x4 MERV 13 Air Filter","description":"\u003cp\u003eThe Ironside 16x24x4 MERV 13 pleated air filter delivers maximum protection for your home or office — engineered to keep your HVAC system running clean and your air clear.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures smoke, bacteria, virus carriers, and wildfire particulates\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x24x4-air-filters\"\u003eAll 16x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 13 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 13 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 13 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636139598066,"sku":"16x24x4M13-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636139630834,"sku":"16x24x4M13-2","price":62.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x24x4-merv-13.jpg?v=1780790665"},{"product_id":"16x24x4-merv-14-plus-carbon","title":"16x24x4 MERV 14 + Carbon Air Filter","description":"\u003cp\u003eThe Ironside 16x24x4 activated-carbon air filter pairs pleated filtration with a carbon layer to trap both airborne particles and the odors that come with cooking, pets, smoke, and VOCs.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCaptures everyday particles \u003cb\u003eplus neutralizes household odors\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 16x24x4 fit\u003c\/b\u003e — sized to drop straight into standard HVAC and furnace systems\u003c\/li\u003e\n\u003cli\u003eElectrostatically charged, moisture-resistant pleated media\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eReplace every 6–12 months for best airflow and efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eBuilt here. Breathe better.\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv data-ironside-specs\u003e\n\u003ch2\u003eSpecs\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16x24x4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActual size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCut to cabinet footprint — see description\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMERV rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFilter type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePleated + activated carbon\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMedia\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectrostatic synthetic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplace\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEvery 6–12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMade in\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSA, by our manufacturing partners\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/16x24x4-air-filters\"\u003eAll 16x24x4 filters →\u003c\/a\u003e · \u003ca href=\"\/blogs\/news\/what-merv-rating-do-i-need\"\u003eWhich MERV do I need?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eProduct FAQ\u003c\/h2\u003e\n\u003ch3\u003eWill a 16x24x4 filter fit my system?\u003c\/h3\u003e\n\u003cp\u003eIf your slot or old filter says 16x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\u003c\/p\u003e\n\u003ch3\u003eWhat does MERV 14 capture?\u003c\/h3\u003e\n\u003cp\u003eMERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\u003c\/p\u003e\n\u003ch3\u003eHow many packs should I buy?\u003c\/h3\u003e\n\u003cp\u003eShipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\u003c\/p\u003e\n\u003ch3\u003eIs this filter made in the USA?\u003c\/h3\u003e\n\u003cp\u003eYes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\" data-ironside-faq\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will a 16x24x4 filter fit my system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If your slot or old filter says 16x24x4, yes — nominal sizes are standardized. This is deep-pleat cabinet media; match the letter code to your cabinet brand.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does MERV 14 capture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MERV 14 captures fine particles including smoke, bacteria-sized particles and the dust that reaches deep into lungs — the right choice for allergies, asthma and wildfire season.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many packs should I buy?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Shipping is flat-rate and stays the same on 1, 2 or 3 packs — so a year's supply in one order is the cheapest way to buy. A 2-pack covers one to two years.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this filter made in the USA?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — American-made by our manufacturing partners with electrostatic synthetic media in heavy-duty frames. Built here. Breathe better.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\u003c\/div\u003e","brand":"Ironside","offers":[{"title":"1 Filter (Single)","offer_id":49636139729138,"sku":"16x24x4M14+C-1","price":56.99,"currency_code":"USD","in_stock":true},{"title":"2-Pack","offer_id":49636139761906,"sku":"16x24x4M14+C-2","price":96.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/files\/16x24x4-merv-14-plus-carbon.jpg?v=1780790665"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0820\/6152\/5234\/collections\/media-filters.png?v=1781026729","url":"https:\/\/getironside.com\/collections\/4-5-media-filters.oembed?page=4","provider":"Ironside.","version":"1.0","type":"link"}