Pad Refills (Pack of 6 Pads) - 20 1/4" x 21 3/4" x 1" Quantity:Default This is designed to fit

This is designed to fit into 1" Return Air Grilles

precisely designed to prevent flame from penetrating the filters and as the grease laden air passes through the filter is collects the grease

Simply cut a hole

the greater it's resistance to airflow

Pad Refills (Pack of 6 Pads) - 20 1/4" x 21 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.