Pad Refills (Pack of 6 Pads) - 11 3/8" x 23 3/8" x 1" Quantity:Default the more efficient a filter

the more efficient a filter is at removing particles

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

these can be purchased in any conceivable size

The A+2000 line is easy to maintain with no need to buy oils or adhesives to enhance effectiveness

the greater it's resistance to airflow

Pad Refills (Pack of 6 Pads) - 11 3/8" x 23 3/8" x 1" Quantity:Default the more efficient a filterPACK 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.