Pad Refills (Pack of 6 Pads) - 21" x 23 1/4" x 1" Quantity:Default The "Practical Pleat" contains over

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

The Pad and Frame Air Filter involves a permanent frame and replaceable filtration pad inserts

built to last a lifetime

Eliminates Filter Bypass

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

Pad Refills (Pack of 6 Pads) - 21" x 23 1/4" x 1" Quantity:Default The "Practical Pleat" contains overPACK 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.