Actual Size: 17.25 x 20.75 x 4.38. Accumulair brand, 17.5x21x4.5 Rheem PD540016 replacement whole house air filters, specifically designed to substitute for the original manufacturer Rheem PD540016 air filters. Completely constructed with no assembly or combs needed. MERV classified to ASHRAE 52.2 test standards ensuring particulate filtration to the level of the original brand Rheem PD540016 air filter. Notice: Example air filter picture displayed is not to scale and is displayed for design purposes. Name brands and Rheem PD540016 identifier are shown for air filter replacement identification purposes.
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