Our Accumulair 20x21.5x4 air filter is specifically made to be compatible with same sized 20x21.5x4 air filter specs. Pleated electrostatic charged filter media traps airborne contaminants according to the ASHRAE MERV rating. Chemical free material. Notice: The sample filter picture as shown is not the actual dimensions and is included to show construction only. Current stock and 20x21.5x4 air filter statements last updated on 03/24/2020.
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