Actual size is 19.75 x 24.25 x 4.75. Accumulair brand: 20x25x5 Trion Air Bear Son of Air Bear substitute whole house filters, exactly constructed to substitute for the original manufacturer Trion Air Bear Son of Air Bear filters. Fully built so no assembly or combs needed. MERV rated to ASHRAE specifications establishing filtration equal to the original brand Trion Air Bear Son of Air Bear air filter. Notice: Sample air filter image as displayed is not the actual dimensions and is included to show design purposes only. OEM names and Trion Air Bear Son of Air Bear identifier are listed for filter replacement identification purposes only.