Our Accumulair brand 21x23.25x4 air filter is exactly made to be compatible with similarly sized 21x23.25x4 air filter type. Pleated static charged filter material traps airborne substances relative to its ASHRAE MERV specification. Chemical free. Note: The sample filter image shown is not the actual dimensions and is shown for construction only. Database and 21x23.25x4 air filter specs last verified on 03/24/2020.
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