Pad Refills (Pack of 6 Pads) - 20" x 21 1/4" x 1" Quantity:Default from the air stream

from the air stream

some just refer to them as electrostatic filters

oxidation and deterioration

Filtering inserts are shipped in an easily stored packet

They are easy to install with custom air filters made to the sizes that you specify

Pad Refills (Pack of 6 Pads) - 20" x 21 1/4" x 1" Quantity:Default from the air streamPACK 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.