KFI SL1000 840cfm Carbon Filter is a Kootenay Filter Inc (KFI) model SL1000 carbon filter built for serious odour control in grow tents and rooms. It is filled with high-quality activated carbon that traps smells as air is pulled through by an inline fan. Sized for systems in the around 840 CFM of airflow range, it’s ideal for matching with a fan of similar capacity for balanced performance. Use it on your exhaust line or as a recirculating scrubber to keep your space smelling clean and discreet.