Actual size is 20.13 x 26 x 3. Accumulair brand, 20x26x3 Lennox X1184 substitute whole house air filters, exactly engineered to substitute for the name brand Lennox X1184 filters. Completely constructed so no forming or combs needed. MERV rated to ASHRAE 52.2 test classifications establishing filtration equal to the original manufacturer Lennox X1184 air filters. Note: The sample air filter pic shown is not to scale and is shown for construction purposes only. Company names and Lennox X1184 P/N are used for air filter replacement identification purposes only.
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