Pad Refills (Pack of 6 Pads) - 18 1/2" x 20 3/4" x 3/4" Quantity:Default You may know them as

You may know them as washable air or even permanent air filters

Available in packs of 4

Water resistant lamp connection

Any Kind of Filter's Extended Surface Pleated Filters outperform ordinary furnace filters with medium efficiency and are designed for lower pressure drop

Pad Refills (Pack of 6 Pads) - 18 1/2" x 20 3/4" x 3/4" Quantity:Default You may know them asPACK 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.