Pad Refills (Pack of 6 Pads) - 21" x 23 1/4" x 1" Quantity:Default You may know them as

You may know them as washable air or even permanent air filters

Instead of face loading (particles captured on the outer surface of the filter)

This design enables A+2000 custom air filters to maintain performance over the years

built to last a lifetime

Pad Refills (Pack of 6 Pads) - 21" x 23 1/4" x 1" Quantity:Default You may know them asPACK 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.