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3" Purolator MERV 8 High-Capacity Pleated Filter for Filter Grilles
(For 14"x14"x3" return air filter grilles ONLY - NOT for Media Air Cleaners. Can ONLY be used on 14"x14"x3" filter grilles.) (We recommend a 3" filter change at least 2 times per year - September & March. For DIRTY environments or most efficient filtration, you may need to change filters...