Actual dimensions are 20.63 x 26.25 x .75. Accumulair brand 21x27x1 Trane TFP210A0FR10 replacement whole house filters, exactly designed to replace original brand Trane TFP210A0FR10 filters. Completely assembled with no assembly or combs required. MERV classified to ASHRAE 52.2 test specs assuring particulate capture equal to the name brand Trane TFP210A0FR10 air filter. Note: The sample air filter picture as shown is not true to size and is there to show design purposes only. Company names and Trane TFP210A0FR10 part numbers used for filter style identification purposes only.