Actual Dimensions: 19.75 x 19.88 x 4.38. Accumulair brand 20x20x5 Honeywell F150E1018 substitute whole house air filters, exactly engineered to replace the original manufacturer Honeywell F150E1018 filters. Completely box-formed - no assembly or combs required. MERV rated to ASHRAE standards ensuring particulate filtration to the level of the original brand Honeywell F150E1018 air filter. Photo: The example air filter pic as displayed is not to scale and is there to show style purposes. Name brands and Honeywell F150E1018 identifier shown for air filter substitution purposes.