Actual Size: 20.75 x 24.25 x 4.38. Accumulair brand: 21x24x4.5 Rheem PD540020 replacement whole house air filters, exactly engineered to substitute for the original manufacturer Rheem PD540020 air filters. Completely box-formed - no forming or combs needed. MERV classified to ASHRAE 52.2 test standards ensuring operation to the level of the OEM Rheem PD540020 air filter. Photo: The sample filter pic shown is not to scale and is shown for style purposes only. OEM names and Rheem PD540020 part numbers are used for filter substitution purposes only.
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