Pad Refills (Pack of 6 Pads) - 20" x 21 1/4" x 1" Quantity:Default Filtering inserts are shipped in

Filtering inserts are shipped in an easily stored packet

some just refer to them as electrostatic filters

One way to overcome this problem is to increase the surface area of the filter media

Unlike some permanent custom air filters

we even have the odd sizes

Pad Refills (Pack of 6 Pads) - 20" x 21 1/4" x 1" Quantity:Default Filtering inserts are shipped inPACK 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.