Filter Hut's Accumulair brand 18x24x4 air filter is specifically designed to substitute for same sized 18x24x4 air filter specs. Pleated electrostatic charged filter media captures contaminants according to the MERV specification. Chemical free. Notice: Sample filter picture shown is not the actual dimensions and is shown for construction purposes. Current stock and 18x24x4 air filter specs current as of 03/24/2020.
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