Description
Actual size is 20.75 x 20.75 x 4.38. Brand: Accumulair. 21x21x4.5 Rheem Protech 540012 substitute whole house filters, exactly engineered to be an alternative to the original brand Rheem Protech 540012 filters. Fully constructed - no forming or combs required. MERV rated to ASHRAE 52.2 test specifications ensuring particle filtration equal to the original brand Rheem Protech 540012 filter. Note: Sample filter picture as displayed is not true to size and is shown for construction only. Name brands and Rheem Protech 540012 P/N included for air filter substitution identification use.