Merv 8 Pleated Air Filter - 21 1/2" x 24 1/4" 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 Pad and Frame Air Filter involves a permanent frame and replaceable filtration pad inserts

And there are no metal parts that could lead to corrosion or oxidation within the filter

the A+2000 uses no foam that may clog

In general

Merv 8 Pleated Air Filter - 21 1/2" x 24 1/4" 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.