Actual size is 19.75 x 20.75 x 4.88. Accumulair brand, 20x20x5 Trion Air Bear 455604-001 compatible whole house filters, specifically constructed to substitute for the original manufacturer Trion Air Bear 455604-001 filters. Fully built - no assembly or combs needed. MERV rated to ASHRAE grades ensuring performance equal to the original manufacturer Trion Air Bear 455604-001 filters. Note: The sample filter image as displayed is not true to size and is there to show style purposes only. Company names and Trion Air Bear 455604-001 part numbers shown for filter replacement identification only.