Pad Refills (Pack of 6 Pads) - 21" x 22" x 3/4" Quantity:Default And there are no metal

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

Can be ordered in packages of 2 each only

PACK of 6 pads for Pad and Frame Air Filters

The A+2000 line is easy to maintain with no need to buy oils or adhesives to enhance effectiveness

Any Kind of Filter's Extended Surface Pleated Filters outperform ordinary furnace filters with medium efficiency and are designed for lower pressure drop

Pad Refills (Pack of 6 Pads) - 21" x 22" x 3/4" Quantity:Default And there are no metalPACK of 6 pads for Pad and Frame Air Filters 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 outlets. Filtering inserts are shipped in an easily stored packet.