Merv 13 Pleated Air Filter - 21 3/8" x 31 1/2" x 2" Quantity:12-pack if not you can measure

if not you can measure it or check the HVAC unit and the owner‰۪s manual

PACK of 6 pads for Pad and Frame Air Filters

No screws need

Simply cut a hole

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

Merv 13 Pleated Air Filter - 21 3/8" x 31 1/2" x 2" Quantity:12-pack if not you can measureAny Kind of Filter's Extended Surface Pleated Filters outperform ordinary furnace filters with medium efficiency and are designed for lower pressure drop, and long service life which reduces HVAC equipment maintenance and energy costs. 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.