Pad and Frame Air Filter (1 Frame and 6 Pads) - 7" x 7" x 3/4" Quantity:Default In general

In general

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

Instead of face loading (particles captured on the outer surface of the filter)

than standard fiberglass filters purchased at retail outlets

the A+2000 uses stage loading

Pad and Frame Air Filter (1 Frame and 6 Pads) - 7" x 7" x 3/4" Quantity:Default In generalIncludes 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