Actual size is 19.88 x 24.88 x 4.38. Accumulair brand: 20x25x5 Lennox X6661 style whole house filters, specifically designed to replace original brand Lennox X6661 filters. Fully box-formed with no assembly or combs required. MERV classified to ASHRAE 52.2 test ratings establishing filtration to the level of the original brand Lennox X6661 filters. Notice: Example air filter image as displayed is not true to size and is there to show construction purposes. Brand names and Lennox X6661 identifier are included for air filter substitution identification purposes only.
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