The Ona Inline Dispenser Duct Mounted is part of any grower's environmental control tools, which ensure exceptional climate conditions for superior crop growth. The block dispensers are made to hold the Ona odour control blocks once you take them out of their containers. Place the blocks inside the ducting and the odour neutralising agents will fragrance the air and eliminate unwanted smells in your grow room. The ducting can accommodate multiple Ona blocks, depending on the size of ducting you choose. Ona's environmental control tools provide the ultimate solution to help you achieve huge harvest yields.