Actual size is 20 x 25.88 x 4.88. Accumulair brand, 20x26x5 Lennox X5428 replacement whole house air filters, exactly designed to substitute for the original manufacturer Lennox X5428 air filters. Completely constructed so no forming or combs needed. MERV rated to ASHRAE 52.2 test specifications establishing performance to the level of the name brand Lennox X5428 filter. Photo: Example filter pic shown is not the actual dimensions and is included to show configuration purposes only. Brand names and Lennox X5428 identifier are included for air filter style identification only.
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