Pad Refills (Pack of 6 Pads) - 19 1/4" x 19 1/4" x 1" Quantity:Default these can be purchased in

these can be purchased in any conceivable size

Can be ordered in packages of 2 each only

In general

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

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

Pad Refills (Pack of 6 Pads) - 19 1/4" x 19 1/4" x 1" Quantity:Default these can be purchased inPACK 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.