Pad and Frame Air Filter (1 Frame and 6 Pads) - 20" x 22" x 3/4" Quantity:Default with each stage capturing progressively

with each stage capturing progressively smaller particles inside the filter

and long service life which reduces HVAC equipment maintenance and energy costs

And there are no metal parts that could lead to corrosion or oxidation within the filter

This is designed to fit into 1" Return Air Grilles

if not you can measure it or check the HVAC unit and the owner‰۪s manual

Pad and Frame Air Filter (1 Frame and 6 Pads) - 20" x 22" x 3/4" Quantity:Default with each stage capturing progressivelyIncludes 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