Actual size is 20.75 x 20.75 x 4.38. Accumulair brand: 21x21x4.5 Rheem PD540018 style whole house filters, specifically constructed to replace the OEM Rheem PD540018 air filters. Completely box-formed - no forming or combs needed. MERV graded to ASHRAE ratings ensuring function to the level of the original brand Rheem PD540018 air filter. Photo: The sample filter image displayed is not the actual dimensions and is displayed for configuration purposes. OEM names and Rheem PD540018 P/N displayed for air filter replacement identification purposes only.
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