Pad Refills (Pack of 6 Pads) - 16 5/8" x 21 1/4" x 3/4" Quantity:Default The permanent frame is constructed

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

than standard fiberglass filters purchased at retail outlets

the greater it's resistance to airflow

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

You never have to hassle with disposable filters that will end up in a landfill again

Pad Refills (Pack of 6 Pads) - 16 5/8" x 21 1/4" x 3/4" Quantity:Default The permanent frame is constructedPACK 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.