Actual Dimensions: 19.88 x 24.88 x 4.38. Accumulair brand, 20x25x5 Honeywell F100F1087 replacement whole house filters, specifically engineered to be an alternative to the original brand Honeywell F100F1087 air filters. Fully assembled with no assembly or combs needed. MERV rated to ASHRAE 52.2 test specs establishing particulate filtration to the level of the OEM Honeywell F100F1087 filters. Photo: The example air filter picture as shown is not to scale and is there to show design purposes. Brand names and Honeywell F100F1087 P/N used for air filter substitution purposes.