Pad Refills (Pack of 6 Pads) - 18" x 18" x 2" Quantity:Default Filtering inserts are anti-microbial and

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

these can be purchased in any conceivable size

Either way

This is designed to fit into 1" Return Air Grilles

The A+2000 line is easy to maintain with no need to buy oils or adhesives to enhance effectiveness

Pad Refills (Pack of 6 Pads) - 18" x 18" x 2" 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.