Actual size is 17.25 x 20.75 x 4.38. Accumulair brand: 17.5x21x4.5 Ruud RXHF-E17AM13 compatible whole house air filters, specifically designed to substitute for the name brand Ruud RXHF-E17AM13 air filters. Fully box-formed with no assembly or combs required. MERV graded to ASHRAE 52.2 test specifications establishing particle filtration equal to the name brand Ruud RXHF-E17AM13 filters. Note: The example air filter pic as shown is not to scale and is there to show style purposes. Company names and Ruud RXHF-E17AM13 part numbers used for filter substitution identification purposes only.
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