Actual Dimensions: 20.75 x 20.75 x 4.38. Brand: Accumulair. 21x21x4.5 Ruud Protech 540012 replacement whole house filters, specifically designed to replace the original manufacturer Ruud Protech 540012 air filters. Fully assembled so no forming or combs required. MERV graded to ASHRAE classifications ensuring particulate capture as good or better than the original manufacturer Ruud Protech 540012 filters. Photo: The sample air filter image displayed is not to scale and is shown for construction only. Name brands and Ruud Protech 540012 P/N used for filter substitution identification purposes only.
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