Actual Size: 20.63 x 26.25 x .75. Accumulair brand: 21x27x1 Trane BAYFTFR21W1A replacement whole house filters, specifically built to substitute for the OEM Trane BAYFTFR21W1A air filters. Completely built with no assembly or combs required. MERV rated to ASHRAE ratings assuring operation to the level of the original brand Trane BAYFTFR21W1A air filters. Note: Sample filter picture as displayed is not the actual dimensions and is included to show design purposes only. Name brands and Trane BAYFTFR21W1A part numbers are listed for filter style identification purposes.
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