Pad Refills (Pack of 6 Pads) - 9 1/2" x 9 1/2" x 1" Quantity:Default the greater it's resistance to

the greater it's resistance to airflow

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

with each stage capturing progressively smaller particles inside the filter

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

Pad Refills (Pack of 6 Pads) - 9 1/2" x 9 1/2" x 1" Quantity:Default the greater it's resistance toPACK 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.