BUILT HERE. BREATHE BETTER.

Find Your Filter.

Check the size printed on the cardboard edge of your old filter, then match it below.

Width

Length

Depth

Not sure of your size? Most homes use 16x25x1 or 20x25x1.

OR SHOP BY PROTECTION

Everyday DefenseMERV 6–8 · dust, lint, pollen Allergy & PetMERV 10–12 · dander, mold, allergens Maximum ProtectionMERV 13–16 · smoke, bacteria, wildfire Odor & SmokeActivated carbon · cooking, pets, VOCs

20x25x5 Air Filters

Quick answer: 20x25x5 is the nominal size for 5-inch media cabinets; it's the media size for 5-inch filter cabinets — including Honeywell F100/F150 (our "H" line), Trion Air Bear ("AB") and Lennox X6673/X6675 ("LXRED") cabinets. Every filter below is American-made deep-pleat media — match the letter code to your cabinet and pick your MERV rating.

Which line fits your cabinet?

H = Honeywell F100/F150 cabinets · AB = Trion Air Bear · LXRED = Lennox X-series · no letter = generic 5-inch slots. Not sure? Our brand guides map the common part numbers, or read the 1-inch vs deep-pleat guide.

20x25x5 FAQ

What is a 20x25x5 air filter?

20x25x5 is nominal media-cabinet sizing. Actual depth runs about 4⅜ inches depending on the cabinet line — that's normal. It's the media size for 5-inch filter cabinets — including Honeywell F100/F150 (our "H" line), Trion Air Bear ("AB") and Lennox X6673/X6675 ("LXRED") cabinets. One media filter replaces a year of monthly 1-inch changes.

Which 20x25x5 line fits my cabinet?

Match the letter to your cabinet: "H" fits Honeywell F100/F150 media cabinets, "AB" fits Trion Air Bear, "LXRED" fits Lennox X-series. The plain 20x25x5 fits generic 5-inch slots. Check the part number on your cabinet door.

How often do I change a 20x25x5 media filter?

Every 6–12 months. Deep pleats hold far more dust than a 1-inch filter, which is why one order of a 2- or 4-pack covers years — and shipping costs the same on 1, 2 or 3 packs.

Ironside 20x25x5 media filters are made in the USA by our manufacturing partners. Replace every 6–12 months. Flat-rate shipping stays the same on 1, 2 or 3 packs — stock two years of clean air in one order. Built here. Breathe better.