Actual size is 20.1 x 21.1 x 5. Accumulair brand, 21x21.5x5 American Standard BAYFTAH21M substitute whole house air filters, specifically engineered to substitute for the original manufacturer American Standard BAYFTAH21M filters. Fully built so no forming or combs needed. MERV classified to ASHRAE 52.2 test specifications assuring particle filtration equal to the OEM American Standard BAYFTAH21M filters. Note: Example filter image displayed is not the actual dimensions and is displayed for construction purposes only. Trade names and American Standard BAYFTAH21M part numbers displayed for filter substitution purposes.
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