Pad Refills (Pack of 6 Pads) - 13 1/2" x 13 1/2" x 1" Quantity:Default these can be purchased in

these can be purchased in any conceivable size

with each stage capturing progressively smaller particles inside the filter

They are easy to clean by simply backwashing every month with cold water so you don‰۪t need expensive cleaners

Produces no ozone or aldehydes

the greater it's resistance to airflow

Pad Refills (Pack of 6 Pads) - 13 1/2" x 13 1/2" x 1" Quantity:Default these can be purchased inPACK 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.