Actual size is 20 x 25.63 x .75. Accumulair brand: 21x26x1 Trane BAYFTAH26W1A compatible whole house filters, exactly designed to be an alternative to the OEM Trane BAYFTAH26W1A air filters. Fully box-formed so no forming or combs required. MERV rated to ASHRAE 52.2 test standards establishing particle filtration to the level of the original manufacturer Trane BAYFTAH26W1A air filters. Notice: The example air filter pic shown is not the actual dimensions and is displayed for style only. Trade names and Trane BAYFTAH26W1A part numbers are used for air filter style identification purposes.
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