Description
Actual Size: 20.75 x 20.75 x 4.38. Accumulair brand 21x21x4.5 Rheem Protech 540012 style whole house air filters, exactly built to substitute for the original brand Rheem Protech 540012 filters. Fully constructed - no assembly or combs needed. MERV rated to ASHRAE 52.2 test specifications assuring filtration equal to the original manufacturer Rheem Protech 540012 air filter. Note: The sample air filter image displayed is not to scale and is shown for style only. Name brands and Rheem Protech 540012 identifier included for air filter substitution identification purposes.