Actual Dimensions: 20.75 x 20.75 x 4.38. Accumulair brand: 21x21x4.5 Ruud RXHF-E21AM10 style whole house air filters, specifically engineered to substitute for the original manufacturer Ruud RXHF-E21AM10 filters. Completely box-formed with no forming or combs required. MERV rated to ASHRAE 52.2 test ratings establishing particulate capture equal to the name brand Ruud RXHF-E21AM10 air filters. Notice: The sample air filter image as displayed is not the actual dimensions and is included to show design purposes. OEM names and Ruud RXHF-E21AM10 identifier are listed for air filter replacement identification use.
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