Maximize the efficiency of ventilation systems with this adjustable speed control kit. It enables users to manually control up to four variable-speed exhaust ventilators from one remote location. It also helps to fine tune ventilator performance. It features a remote dial, transformer, and hardware. Mounts to a wall using a 2x4 junction box. When used with a Dayton EC motor, it can help maximize the efficiency of the ventilation system. Use in commercial buildings and restaurants; in manual or automated operation to control the demand of the ventilation system. Includes a 24 volt transformer to power the remote and motor controls. Transformer supplies low voltage to the speed control accepting dual voltage (115/208-240V).