Description
Actual size is 17.25 x 20.75 x 4.38. Brand: Accumulair. 17.5x21x4.5 Ruud Protech 540010 substitute whole house filters, specifically designed to replace the name brand Ruud Protech 540010 filters. Completely constructed with no assembly or combs required. MERV classified to ASHRAE 52.2 test grades establishing filtration as good or better than the original manufacturer Ruud Protech 540010 air filters. Note: Example air filter image displayed is not to scale and is shown for design purposes. OEM names and Ruud Protech 540010 identifier included for filter substitution identification only.