Actual size is 16.63 x 26 x 4.13. Accumulair brand 17x26x4 Lennox X6666 replacement whole house air filters, specifically constructed to replace the original brand Lennox X6666 air filters. Completely constructed so no forming or combs needed. MERV graded to ASHRAE 52.2 test specs establishing function equal to the OEM Lennox X6666 filters. Notice: The sample filter pic shown is not to scale and is there to show configuration only. Trade names and Lennox X6666 identifier are included for air filter replacement identification purposes.
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