Filter Hut's Accumulair brand 16x21.5x4 air filter is solely engineered to replace same sized 16x21.5x4 air filter specs. Pleated electrostatically charged filter media captures contaminants in the air relative to its ASHRAE MERV rating. Chemical free material. Notice: Example filter image shown is not to scale and is shown for design purposes only. Current stock and 16x21.5x4 air filter variations are up to date as of 03/24/2020.
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