Pad Refills (Pack of 6 Pads) - 23 3/4" x 23 3/4" x 1" Quantity:Default This is designed to fit

This is designed to fit into 1" Return Air Grilles

built to last a lifetime

And there are no metal parts that could lead to corrosion or oxidation within the filter

The permanent frame is constructed of space-age plastics that are resistant to corrosion

Eliminates Filter Bypass

Pad Refills (Pack of 6 Pads) - 23 3/4" x 23 3/4" 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.