Pad and Frame Air Filter (1 Frame and 6 Pads) - 19 5/8" x 19 5/8" x 3/4" Quantity:Default the A+2000 uses stage loading

the A+2000 uses stage loading

This design enables A+2000 custom air filters to maintain performance over the years

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

degrade and restrict air flow

Either way

Pad and Frame Air Filter (1 Frame and 6 Pads) - 19 5/8" x 19 5/8" 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