Pad Refills (Pack of 6 Pads) - 20" x 20 1/2" x 3/4" Quantity:Default we even have the odd

we even have the odd sizes

The "Practical Pleat" media is up to 28 times more effective at capturing particles than standard fiberglass panel filters

In general

if not you can measure it or check the HVAC unit and the owner‰۪s manual

Pad Refills (Pack of 6 Pads) - 20" x 20 1/2" x 3/4" Quantity:Default we even have the oddPACK of 6 pads for Pad and Frame Air Filters Filtering inserts are anti microbial and are more efficient in capturing particles, such as dust, ragweed, pollen, etc., from the air stream, than standard fiberglass filters purchased at retail outlets. Filtering inserts are shipped in an easily stored packet.