Actual dimensions are 20.75 x 20.25 x 5.25. Accumulair brand: 20x20x5 Coleman P102-MF14B compatible whole house air filters, specifically constructed to replace the name brand Coleman P102-MF14B air filters. Fully constructed - no assembly or combs required. MERV rated to ASHRAE 52.2 test specs establishing particle capture to the level of the original brand Coleman P102-MF14B filter. Note: The example air filter picture shown is not true to size and is there to show configuration purposes only. Name brands and Coleman P102-MF14B P/N are used for air filter substitution identification.