This Accumulair brand 20x40x4 air filter is exactly designed to be a replacement for same sized 20x40x4 air filter specification. Pleated electrostatic charged media captures airborne particles relative to its ASHRAE MERV specification. Chemical free. Note: Sample filter picture shown is not to scale and is displayed for construction only. Catalog and 20x40x4 air filter statements are up to date as of 03/24/2020.
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