Actual size is 20 x 21.13 x .75. Accumulair brand, 21x21.5x1 Trane BAYFTAH21W1A substitute whole house filters, specifically designed to replace OEM Trane BAYFTAH21W1A filters. Fully assembled with no forming or combs required. MERV classified to ASHRAE standards assuring particle filtration as good or better than the name brand Trane BAYFTAH21W1A air filters. Photo: Sample air filter pic as shown is not to scale and is shown for style only. Name brands and Trane BAYFTAH21W1A P/N shown for air filter substitution identification purposes only.
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