Pad Refills (Pack of 6 Pads) - 11 1/2" x 11 1/2" x 1" Quantity:Default with each stage capturing progressively

with each stage capturing progressively smaller particles inside the filter

To find the size the old unit should have sizing information printed on it

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

from the air stream

Pad Refills (Pack of 6 Pads) - 11 1/2" x 11 1/2" x 1" Quantity:Default with each stage capturing progressivelyPACK 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.