Pad and Frame Air Filter (1 Frame and 6 Pads) - 20" x 25" x 1" Quantity:Default This is designed to fit

This is designed to fit into 1" Return Air Grilles

To find the size the old unit should have sizing information printed on it

such as dust

with each stage capturing progressively smaller particles inside the filter

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

Pad and Frame Air Filter (1 Frame and 6 Pads) - 20" x 25" x 1" Quantity:Default This is designed to fitIncludes 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