Can filters is a leading name in the realm of hydroponics for excellent air filtration instruments, eliminating a wide range of VOCs (volatile organic compounds), smells, and other gaseous pollutants. They work by an adsorption process in which VOCs, smells, and other gaseous pollutants cling to the carbon's surface. 4In Flanges work with fans, filters, and ducting that are compatible... https://www.hydroponicstown.com/brand/can-filter