Actual Dimensions: 20.75 x 20.75 x 4.38. Accumulair brand 21x21x4.5 Ruud RXHF-E21AM13 substitute whole house air filters, exactly built to be an alternative to the OEM Ruud RXHF-E21AM13 air filters. Completely built with no forming or combs needed. MERV graded to ASHRAE 52.2 test classifications establishing particle capture as good or better than the original manufacturer Ruud RXHF-E21AM13 air filters. Notice: The example air filter picture displayed is not to scale and is there to show style only. Trade names and Ruud RXHF-E21AM13 P/N used for filter substitution identification.
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