Check the listing for details. Vivosun 4/6/8" Air Carbon Filter 38mm Charcoal Bed w/ Pre-Filter for Inline Fan. Color: Silver, Condition: New. Listed at 36.99 USD. About this item Excellent Odor Control: Made of premium RC 412 Australian Virgin charcoal at 1200+ IAV, helps to eliminate pungent smells and chemicals; The 38mm thick charcoal bed with high microporosity ensures its high absorption Unique Design: The dual-sided galvanized steel mesh adopt round hole design, which greatly increases the open area and ensures the max. airflow 223 CFM/384CFM/590 CFM; The lengthened carbon canister enables a higher filtration rate Versatile Applications: The detachable pre-filter cloth blocks 99% particles to keep the filter clean; Effective to eliminate odors and gaseous compounds for indoor grow tent, hydroponics room, kitchen or basement Reversible Flange and Base: The heavy-duty iron flange and base can be exchanged to reverse the charcoal canister for an exhaustive smell filtration and help to prolong the filter’s service life Compatible Function: It can work with a 8-inch inline duct fan to configure both intake and exhaust ventilation system; Comes with a pair of belts which makes the assembly in grow tent more convenient