Pad Refills (Pack of 6 Pads) - 20" x 23" x 1" Quantity:Default A higher MERV rating means

A higher MERV rating means that the air filter that you are about to purchase possesses a higher amount impurity filtration ability than your ordinary filter

In general

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

Can be ordered in packages of 2 each only

Either way

Pad Refills (Pack of 6 Pads) - 20" x 23" x 1" Quantity:Default A higher MERV rating meansPACK 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.