Actual dimensions are 19.88 x 24.88 x 4.38. Accumulair brand: 20x25x5 Honeywell F55A1384 style whole house filters, exactly built to replace the original manufacturer Honeywell F55A1384 filters. Fully box-formed - no forming or combs required. MERV rated to ASHRAE standards assuring particulate filtration as good or better than the original manufacturer Honeywell F55A1384 air filters. Notice: The example filter pic as shown is not true to size and is there to show construction purposes. Trade names and Honeywell F55A1384 P/N are used for air filter style purposes.