Description
Actual dimensions are 20.75 x 20.75 x 4.38. Accumulair brand, 21x21x4.5 Ruud RXHF-E21AM13 compatible whole house filters, specifically designed to be an alternative to the original brand Ruud RXHF-E21AM13 filters. Fully box-formed - no assembly or combs needed. MERV graded to ASHRAE 52.2 test specifications ensuring particulate filtration to the level of the name brand Ruud RXHF-E21AM13 filters. Notice: The example air filter picture as displayed is not the actual dimensions and is shown for configuration only. Company names and Ruud RXHF-E21AM13 identifier are used for filter substitution identification only.