Description
Actual dimensions are 20.75 x 24.25 x 4.38. Accumulair brand: 21x24x4.5 Rheem PD540020 substitute whole house filters, specifically built to be an alternative to the original manufacturer Rheem PD540020 filters. Completely constructed with no assembly or combs needed. MERV rated to ASHRAE 52.2 test specs establishing function to the level of the OEM Rheem PD540020 air filters. Notice: The sample air filter picture shown is not true to size and is shown for style purposes. Company names and Rheem PD540020 part numbers shown for air filter substitution identification.