This Filter Hut Accumulair 21.25x21.25x4 air filter is solely built to replace same sized 21.25x21.25x4 air filter type. Pleated electrostatically charged filter material traps airborne contaminants according to the MERV rating. Chemical free material. Notice: Example filter image as shown is not the actual dimensions and is displayed for design purposes only. Current stock and 21.25x21.25x4 air filter variations last verified on 03/24/2020.
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