Description
Actual size is 19.5 x 19.5 x 3.75. Accumulair brand, 20x20x4 20x20x4 Top Tech compatible whole house air filters, specifically built to replace the original brand 20x20x4 Top Tech filters. Completely assembled so no forming or combs required. MERV classified to ASHRAE 52.2 test grades ensuring function to the level of the original brand 20x20x4 Top Tech air filter. Photo: The example air filter image displayed is not to scale and is included to show construction purposes. OEM names and 20x20x4 Top Tech P/N are included for air filter replacement identification purposes only.