Description
Actual dimensions are 20.1 x 21.1 x 5. Accumulair brand 21x21.5x5 Honeywell TRN2121T1 style whole house air filters, exactly built to be an alternative to the original brand Honeywell TRN2121T1 air filters. Fully box-formed so no assembly or combs required. MERV rated to ASHRAE 52.2 test classifications ensuring operation equal to the OEM Honeywell TRN2121T1 air filters. Note: The example filter pic shown is not the actual dimensions and is displayed for construction only. Brand names and Honeywell TRN2121T1 part numbers are included for air filter replacement identification purposes.