Our Accumulair 20x21x4 air filter is solely built to be compatible with similarly sized 20x21x4 air filter specs. Pleated electrostatically charged filter media captures contaminants according to the MERV standard specification. Free of chemicals. Note: The example filter image as shown is not to scale and is shown for style purposes only. Database and 20x21x4 air filter specs are up to date as of 03/24/2020.
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