Actual dimensions are 19.75 x 19.88 x 4.38. Accumulair brand, 20x20x5 Honeywell F25F1018 compatible whole house filters, exactly designed to replace the name brand Honeywell F25F1018 filters. Completely assembled - no forming or combs required. MERV rated to ASHRAE 52.2 test ratings assuring operation to the level of the name brand Honeywell F25F1018 filter. Note: The example air filter image as displayed is not the actual dimensions and is shown for style only. OEM names and Honeywell F25F1018 P/N are shown for air filter substitution purposes.
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