Pad and Frame Air Filter (1 Frame and 6 Pads) - 21 1/2" x 23 1/2" x 1" Quantity:Default such as dust

such as dust

The "Practical Pleat" media is up to 28 times more effective at capturing particles than standard fiberglass panel filters

than standard fiberglass filters purchased at retail outlets

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

Pad and Frame Air Filter (1 Frame and 6 Pads) - 21 1/2" x 23 1/2" x 1" Quantity:Default such as dustIncludes one Frame and PACK of 6 pads The Pad and Frame Air Filter involves a permanent frame and replaceable filtration pad inserts. The permanent frame is constructed of space age plastics that are resistant to corrosion, oxidation and deterioration. 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