Description
Actual size is 20.75 x 24.25 x 4.38. Accumulair brand 21x24x4.5 Ruud Protech 540020 replacement whole house filters, specifically built to replace the OEM Ruud Protech 540020 filters. Fully assembled - no assembly or combs required. MERV graded to ASHRAE 52.2 test standards establishing function to the level of the original brand Ruud Protech 540020 filter. Note: The example filter image shown is not true to size and is displayed for style only. Brand names and Ruud Protech 540020 part numbers included for filter replacement identification use.