Pad Refills (Pack of 6 Pads) - 6" x 8 1/4" x 1" Quantity:Default the A+2000 uses no foam

the A+2000 uses no foam that may clog

PACK of 6 pads for Pad and Frame Air Filters

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

In general

Pad Refills (Pack of 6 Pads) - 6" x 8 1/4" x 1" Quantity:Default the A+2000 uses no foamPACK 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.