Pad and Frame Air Filter (1 Frame and 6 Pads) - 17 1/2" x 33 1/4" x 3/4" Quantity:Default and the greater the pressure

and the greater the pressure drop it creates

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

This is designed to fit into 1" Return Air Grilles

You never have to hassle with disposable filters that will end up in a landfill again

Pad and Frame Air Filter (1 Frame and 6 Pads) - 17 1/2" x 33 1/4" x 3/4" Quantity:Default and the greater the pressureIncludes one Frame and PACK of 6 pads The Pad and Frame Air Filter involves a permanent frame and replaceable filtration pad inserts. The permanent frame is constructed of space age plastics that are resistant to corrosion, oxidation and deterioration. 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