Description
Actual dimensions are 20.75 x 20.75 x 4.38. Accumulair brand, 21x21x4.5 Ruud RXHF-E21AM13 substitute whole house filters, specifically constructed to replace original manufacturer Ruud RXHF-E21AM13 air filters. Fully assembled with no assembly or combs needed. MERV classified to ASHRAE 52.2 test specs assuring particulate capture equal to the OEM Ruud RXHF-E21AM13 filter. Note: The example air filter pic as displayed is not the actual dimensions and is shown for configuration purposes only. Name brands and Ruud RXHF-E21AM13 part numbers included for filter replacement purposes.