Actual Size: 17.25 x 20.75 x 4.38. Brand: Accumulair. 17.5x21x4.5 Ruud Protech 540010 substitute whole house air filters, specifically engineered to replace the original manufacturer Ruud Protech 540010 air filters. Completely built - no forming or combs needed. MERV rated to ASHRAE 52.2 test specs establishing particle capture equal to the original manufacturer Ruud Protech 540010 filters. Photo: Sample filter image shown is not true to size and is displayed for design only. OEM names and Ruud Protech 540010 part numbers are used for filter style identification purposes only.
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