Merv 8 Pleated Air Filter - 21 3/8" x 21 1/2" x 1" Quantity:12-pack To find the size the

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

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

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

Instead of face loading (particles captured on the outer surface of the filter)

This is a 5" MERV 10 HIGH PERFORMANCE AIR FILTER

Merv 8 Pleated Air Filter - 21 3/8" x 21 1/2" x 1" Quantity:12-pack To find the size theAny 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.