Actual dimensions are 19.75 x 19.88 x 4.38. Accumulair brand: 20x20x5 Honeywell X0585 replacement whole house air filters, exactly engineered to replace the original manufacturer Honeywell X0585 air filters. Completely constructed so no assembly or combs required. MERV classified to ASHRAE 52.2 test standards establishing particle filtration as good or better than the OEM Honeywell X0585 air filters. Note: The example filter pic displayed is not true to size and is shown for construction only. OEM names and Honeywell X0585 P/N are shown for air filter substitution purposes only.
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