Description
Actual size is 19.75 x 19.88 x 4.38. Accumulair brand, 20x20x5 Honeywell 203721 substitute whole house air filters, exactly built to substitute for the OEM Honeywell 203721 filters. Completely constructed so no forming or combs needed. MERV rated to ASHRAE 52.2 test specs assuring particle filtration to the level of the original brand Honeywell 203721 air filters. Photo: The example filter image as displayed is not the actual dimensions and is included to show style purposes only. Trade names and Honeywell 203721 P/N are included for filter substitution identification.