Actual dimensions are 20.75 x 20.25 x 5.25. Accumulair brand, 20x20x5 Westinghouse MU2020 style whole house filters, specifically designed to substitute for the OEM Westinghouse MU2020 filters. Completely assembled so no forming or combs needed. MERV classified to ASHRAE 52.2 test ratings assuring particle filtration as good or better than the original manufacturer Westinghouse MU2020 air filters. Note: Example filter image shown is not true to size and is there to show style purposes. Name brands and Westinghouse MU2020 P/N are used for air filter replacement identification.
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