Actual Dimensions: 20 x 20.63 x 4.38. Accumulair brand 20x21x5 Lennox X8790 replacement whole house air filters, specifically built to substitute for the original brand Lennox X8790 air filters. Fully built so no assembly or combs required. MERV classified to ASHRAE 52.2 test specs establishing particulate filtration equal to the original manufacturer Lennox X8790 air filters. Notice: Example air filter picture as shown is not true to size and is shown for design purposes only. Name brands and Lennox X8790 part numbers are shown for air filter substitution identification purposes only.
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