Pad Refills (Pack of 6 Pads) - 21" x 23" x 1" Quantity:Default Filtering inserts are anti-microbial and

Filtering inserts are anti-microbial and are more efficient in capturing particles

In general

the "A+2000" brand Permanent Washable Electrostatic custom air filters are truly quality products

Unlike some permanent custom air filters

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

Pad Refills (Pack of 6 Pads) - 21" x 23" x 1" Quantity:Default Filtering inserts are anti-microbial andPACK 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.