Merv 11 Pleated Air Filter - 21" x 24" x 1" Quantity:12-pack In general

In general

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

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This is designed to fit into 1" Return Air Grilles

Merv 11 Pleated Air Filter - 21" x 24" x 1" Quantity:12-pack In generalAny 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.