Pad Refills (Pack of 6 Pads) - 19 1/4" x 23 1/4" x 1" Quantity:Default the A+2000 uses stage loading

the A+2000 uses stage loading

The "Practical Pleat" contains over 500% greater surface area than a MERV 10 one-inch pleat

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

and the greater the pressure drop it creates

such as dust

Pad Refills (Pack of 6 Pads) - 19 1/4" x 23 1/4" x 1" Quantity:Default the A+2000 uses stage loadingPACK 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.