Actual dimensions are 20.75 x 20.25 x 5.25. Accumulair brand 20x20x5 Clean Comfort M2-1056 substitute whole house air filters, exactly built to be an alternative to the original manufacturer Clean Comfort M2-1056 filters. Completely assembled with no forming or combs required. MERV classified to ASHRAE specifications assuring filtration equal to the original brand Clean Comfort M2-1056 filter. Note: The example filter picture as shown is not true to size and is included to show design only. Name brands and Clean Comfort M2-1056 P/N displayed for filter substitution identification.