This Accumulair brand 21.5x23.25x4 air filter is specifically built to substitute for similarly sized 21.5x23.25x4 air filter specification. Pleated electrostatically charged media captures airborne particles according to the ASHRAE MERV specification. Chemical free. Notice: Sample filter image displayed is not to scale and is displayed for design purposes only. Current stock and 21.5x23.25x4 air filter variations last verified on 03/24/2020.
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