Actual Dimensions: 17.25 x 20.75 x 4.38. Accumulair brand 17.5x21x4.5 Ruud PD540010 substitute whole house filters, specifically engineered to substitute for the original manufacturer Ruud PD540010 air filters. Fully assembled so no forming or combs needed. MERV rated to ASHRAE standards ensuring filtration as good or better than the original brand Ruud PD540010 air filter. Photo: The example air filter picture as displayed is not the actual dimensions and is shown for style purposes only. Brand names and Ruud PD540010 identifier displayed for filter replacement identification purposes only.
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