Pad and Frame Air Filter (1 Frame and 6 Pads) - 20" x 22" x 3/4" Quantity:Default and the greater the pressure

and the greater the pressure drop it creates

with each stage capturing progressively smaller particles inside the filter

the "A+2000" brand Permanent Washable Electrostatic custom air filters are truly quality products

The permanent frame is constructed of space-age plastics that are resistant to corrosion

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

Pad and Frame Air Filter (1 Frame and 6 Pads) - 20" x 22" x 3/4" Quantity:Default and the greater the pressureIncludes 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