The Airbox 1 carbon filter is 100% airtight and easy to setup, use, and maintain. With 4" flanges and a CFM of 500, these units fit into all ducting and filtering systems.The Airbox 1 carbon filter is 100% airtight and easy to setup, use, and maintain. With 4" flanges and a CFM of 500, these units fit into all ducting and filtering systems. They utilize 100% premium virgin coconut charcoal and feature replaceable high-flow filters which use 100% of the available surface area, for optimum performance. Great for commercial or residential use. (1) pre-filter included. Made in the USA.
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