AprilAire 310
MERV 11Cabinet media
Cabinet models: 1310, 2310, 3310, 4300
Known size
20x20 filter paths
Use nominal size as the starting point, then confirm the filter type/depth and filtration level before buying.
1. Size20x20
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.
AprilAire 313
MERV 13Cabinet media
Cabinet models: 1310, 2310, 3310, 4300
AprilAire 1310
Cabinet / housing
Replacement media: 310, 313
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.
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.
MERV caution
Higher MERV is not automatically better if the system cannot handle the airflow resistance.