Allergy Filter Depot 21x26x5 (20.1x25.7x5) merv 11 aftermarket american standard replacement filter (2 pack)

The nominal size is 21 x 26 x 5. The actual size is 20.1 x 25.7 x 5.*It has 98% efficient filtration media.*It is up to twenty times more effective than ordinary fiberglass filters.*High-efficiency filter media collects small dust particles before they can collect on your coils.*This is an aftermarket filter.

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