Pad Refills (Pack of 6 Pads) - 21" x 23" x 1" Quantity:Default This is designed to fit

This is designed to fit into 1" Return Air Grilles

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

the A+2000 uses no foam that may clog

Finally they are factory made so you don‰۪t have to deal with the hassle of trying to cut and size your custom air filters and they come with a full warranty

Pad Refills (Pack of 6 Pads) - 21" x 23" x 1" Quantity:Default This is designed to fitPACK 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.