Our Accumulair 19.75x21x4 air filter is exactly constructed to substitute for similarly sized 19.75x21x4 air filter specs. Pleated electrostatic charged media traps airborne particles according to the MERV rating. Chemical free material. Notice: Example filter image as shown is not the actual dimensions and is included to show style purposes only. Catalog and 19.75x21x4 air filter statements current as of 03/24/2020.
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