Actual dimensions are 16.63 x 26 x 4.13. Accumulair brand: 17x26x4 Lennox X6664 style whole house filters, exactly built to be an alternative to the name brand Lennox X6664 air filters. Completely constructed - no forming or combs needed. MERV classified to ASHRAE specifications assuring particle capture equal to the name brand Lennox X6664 air filter. Note: Example filter pic displayed is not to scale and is included to show construction purposes. OEM names and Lennox X6664 P/N are listed for air filter substitution purposes.
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