HydroKraken Carbon Charcoal In Line Air Scrubber Filter For Maximum Odor Control & Filter Cover (6 inch flange) MAXIMUM AIRFLOW: Up to 440 CFM Air Flow, with 6" compatible connection flange ABSOLUTE ODOR CONTROL: Whether your goal is removing pungent smells for privacy, or smoke form a cigar shop, this filter removes 99.7% of air particulates using activated charcoal. The gold standard for odor control PRE-FILTER INCLUDED: Extend the life of your filter and get better control over your airflow with a washable pre filter, and a flange that can be reattached at either end 50mm Carbon Layer of Thickness for Higher Absorption and Performance RC 48 Virgin Activated Carbon / Aluminum Cap Construction for Maximum Output