Pad and Frame Air Filter (1 Frame and 6 Pads) - 20" x 20" x 3/4" Quantity:Default the A+2000 uses stage loading

the A+2000 uses stage loading

A higher MERV rating means that the air filter that you are about to purchase possesses a higher amount impurity filtration ability than your ordinary filter

In general

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 20" x 3/4" Quantity:Default the A+2000 uses stage loadingIncludes 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