Our Accumulair 16.5x21x4 air filter is solely made to be compatible with same sized 16.5x21x4 air filter specs. Pleated static charged media captures airborne particles according to the ASHRAE MERV rating. Material is free of chemicals. Note: The example filter image shown is not the actual dimensions and is displayed for style purposes only. Catalog and 16.5x21x4 air filter variations last verified on 03/24/2020.
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