When the temperature is higher than the set full speed temperature, the fan runs at full speed, When the temperature is lower than the set starting temperature value, the governor controls the fan to stop or maintain a low speed This governor is suitable for AC 220V/110V 50Hz&60Hz fan motors. The governor can control the voltage of the fan according to the monitored temperature, so as to realize the speed control of the fan/motor When the temperature is between the -up temperature and the full-speed temperature, the fan speed increases as the temperature increases, and slows down as the temperature decreases, so as to achieve the purpose of intelligent temperature control, saving, noise reduction and emission reduction., Weight: 0.22928075248 Pounds, Manufacturer: Prterver