Our Accumulair 21.5x26x4 air filter is solely designed to be a replacement for same sized 21.5x26x4 air filter specs. Pleated static charged filter media traps contaminants according to the MERV specification. Free of chemicals. Notice: The example filter picture displayed is not to scale and is displayed for design purposes only. Catalog and 21.5x26x4 air filter statements are up to date as of 03/24/2020.
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