It adopts bidirectional control and can be according to different requirements. Can be equipped with a temperature controller: can be used with a series of thermostats, automatic switch, so that the controlled environment is effectively controlled, so that -saving comfort and no noise. Mirror: round air valve adopts high quality motor, beautiful and reliable operation, low failure rate, the material of the valve body is made of mirror, resistance, high-grade appearance. The actuator has the characteristics of small size, high torque and long service life. HVAC Air Duct Valve / Electric Air Duct Damper / Motorized Damper 125MM 220V, Weight: 1.71188946443 Pounds, Manufacturer: Jaywool