Actual dimensions are 20.75 x 20.25 x 5.25. Accumulair brand 20x20x5 Coleman CMF2020 style whole house air filters, exactly designed to be an alternative to the name brand Coleman CMF2020 air filters. Completely constructed with no assembly or combs required. MERV classified to ASHRAE 52.2 test grades assuring particle filtration to the level of the original manufacturer Coleman CMF2020 filter. Note: Sample air filter picture as shown is not to scale and is there to show style purposes. Brand names and Coleman CMF2020 P/N shown for air filter replacement identification purposes only.