Description
Actual dimensions are 20.75 x 20.75 x 4.38. Accumulair brand: 21x21x4.5 Rheem PD540012 replacement whole house filters, exactly constructed to substitute for the original manufacturer Rheem PD540012 air filters. Fully built with no assembly or combs needed. MERV rated to ASHRAE 52.2 test classifications establishing operation as good or better than the OEM Rheem PD540012 filters. Note: The example air filter image shown is not to scale and is there to show style purposes only. Name brands and Rheem PD540012 P/N used for air filter style purposes only.