Filter Hut's Accumulair brand 16.25x21x4 air filter is exactly built to substitute for same sized 16.25x21x4 air filter specs. Pleated electrostatic charged media traps contaminants according to the MERV standard rating. Chemical free. Notice: The sample filter picture displayed is not to scale and is displayed for design purposes only. Current stock and 16.25x21x4 air filter specs last verified on 03/24/2020.
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