Our Accumulair 12.5x21x4 air filter is exactly engineered to be compatible with same sized 12.5x21x4 air filter style. Pleated static charged filter media traps airborne contaminants according to the ASHRAE MERV specification. Material is free of chemicals. Note: The example filter image shown is not the actual dimensions and is included to show construction purposes. Catalog and 12.5x21x4 air filter specs last updated on 03/24/2020.
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