Description
Actual Dimensions: 20.75 x 24.25 x 4.38. Accumulair brand, 21x24x4.5 Ruud Protech 540020 substitute whole house air filters, specifically built to substitute for the name brand Ruud Protech 540020 filters. Completely built - no assembly or combs needed. MERV rated to ASHRAE 52.2 test grades assuring filtration to the level of the OEM Ruud Protech 540020 filter. Notice: The sample filter image shown is not the actual dimensions and is displayed for style only. Name brands and Ruud Protech 540020 P/N are shown for filter substitution identification use.