Our Accumulair brand 11.5x21x4 air filter is specifically constructed to substitute for similarly sized 11.5x21x4 air filter specification. Pleated static charged filter media traps contaminants in the air relative to its MERV rating. Chemical free. Note: Sample filter picture shown is not the actual dimensions and is included to show style purposes only. Catalog and 11.5x21x4 air filter statements last verified on 03/24/2020.
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