20x20x4 MERV 12 Air Filter

The Ironside 20x20x4 MERV 12 pleated air filter delivers allergy & pet defense for your home or office — engineered to keep your HVAC system running clean and your air clear.

• Captures pet dander, mold spores, and fine allergens
• True 20x20x4 fit — sized to drop straight into standard HVAC and furnace systems
• Electrostatically charged, moisture-resistant pleated media
• Made in the USA
• Replace every 6–12 months for best airflow and efficiency

Built here. Breathe better.