Actual dimensions are 19.5 x 19.5 x 3.75. Accumulair brand 20x20x4 20x20x4 Top Tech compatible whole house filters, specifically designed to replace OEM 20x20x4 Top Tech filters. Fully constructed - no forming or combs required. MERV classified to ASHRAE 52.2 test classifications establishing operation equal to the name brand 20x20x4 Top Tech filters. Note: The sample air filter pic as shown is not to scale and is displayed for design purposes. Company names and 20x20x4 Top Tech part numbers shown for filter replacement purposes.
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