Actual Dimensions: 20 x 25.5 x 4.38. Accumulair brand: 20x26x5 Lennox PCO20-28 substitute whole house air filters, exactly constructed to replace original manufacturer Lennox PCO20-28 filters. Fully built so no forming or combs needed. MERV rated to ASHRAE standards ensuring particulate capture equal to the original brand Lennox PCO20-28 air filter. Notice: The sample filter image as displayed is not to scale and is included to show construction purposes only. Trade names and Lennox PCO20-28 part numbers are used for air filter replacement identification only.
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