Better Air Filter Finder

Known size

16x20 filter paths

Use nominal size as the starting point, then confirm the filter type/depth and filtration level before buying.

Open helper flow AprilAire cabinet media
1. Size16x20
2. Type/depthAprilAire cabinet media, name-brand 4-inch, or name-brand 1-inch.
3. FiltrationMERV 11/12, MERV 13/14, or MERV 16 where compatible.

Path A

AprilAire cabinet/media options

Only use these when your cabinet or media model matches. Nominal size alone is not enough to prove fit.

Name-brand 4-inch

Verified retail product rows are not populated yet. Look for 3M Filtrete, Honeywell, or Lennox labels, and match exact nominal size, depth, and MERV/MPR/FPR.

General replacement: about every 3 months.

Broad retail search links

These are broad retailer searches, not verified product listings. Confirm exact size, depth, MERV/MPR/FPR, pack count, price, and availability before buying.

Search 16x20x4 3M Filtrete at CostcoBroad retail searchSearch 16x20x4 Honeywell at AmazonBroad retail searchSearch 16x20x4 Honeywell at Home DepotBroad retail searchSearch 16x20x4 Lennox at AmazonBroad retail searchSearch 16x20x4 Lennox at Home DepotBroad retail search

Name-brand 1-inch

Verified retail product rows are not populated yet. These are common and simple, but usually need more frequent replacement.

General replacement: check/change about monthly.

Broad retail search links

These are broad retailer searches, not verified product listings. Confirm exact size, depth, MERV/MPR/FPR, pack count, price, and availability before buying.

Search 16x20x1 3M Filtrete at AmazonBroad retail searchSearch 16x20x1 3M Filtrete at Home DepotBroad retail searchSearch 16x20x1 3M Filtrete at CostcoBroad retail searchSearch 16x20x1 Honeywell at AmazonBroad retail searchSearch 16x20x1 Honeywell at Home DepotBroad retail search

MERV caution

Higher MERV is not automatically better if the system cannot handle the airflow resistance.