Actual size is 20.75 x 24.25 x 4.38. Accumulair brand 21x24x4.5 Ruud PD540014 compatible whole house filters, exactly built to replace OEM Ruud PD540014 air filters. Fully assembled so no forming or combs required. MERV classified to ASHRAE 52.2 test standards establishing performance equal to the original manufacturer Ruud PD540014 air filter. Note: Example air filter pic as displayed is not the actual dimensions and is included to show configuration only. OEM names and Ruud PD540014 part numbers included for air filter replacement purposes.
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