Description
Actual size is 20.75 x 20.75 x 4.38. Brand: Accumulair. 21x21x4.5 Ruud RXHF-E21AM13 replacement whole house filters, specifically engineered to replace the OEM Ruud RXHF-E21AM13 air filters. Fully built with no assembly or combs required. MERV classified to ASHRAE 52.2 test classifications assuring function as good or better than the name brand Ruud RXHF-E21AM13 air filter. Notice: The example filter pic shown is not the actual dimensions and is included to show configuration only. Brand names and Ruud RXHF-E21AM13 part numbers are included for filter style identification.