Description
Actual Size: 20.75 x 24.25 x 4.38. Accumulair brand 21x24x4.5 Ruud Protech 540020 substitute whole house filters, exactly designed to substitute for the OEM Ruud Protech 540020 air filters. Fully built so no forming or combs required. MERV graded to ASHRAE specs ensuring filtration to the level of the OEM Ruud Protech 540020 air filters. Note: Sample air filter picture as displayed is not to scale and is displayed for design purposes only. OEM names and Ruud Protech 540020 P/N are included for air filter replacement identification use.