Our Accumulair 20x21x1 air filter is exactly engineered to be a replacement for same sized 20x21x1 air filter type. Pleated static charged media traps contaminants according to the ASHRAE MERV rating. Free of chemicals. Note: Sample filter picture shown is not the actual dimensions and is shown for style only. Catalog and 20x21x1 air filter variations current as of 03/24/2020.
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