Usage Tips:Features: Actuator + air valve: The electric air valve is composed of two parts: the actuator and the air valve. The actuator has the characteristics of small size, high torque and long service life. It adopts bidirectional control and can be selected according to different requirements. valve leaf: The air valve leaf adopts aluminum plate stamping molding, equipped with silicone sealing ring, good airtightness, easy wear and corrosion resistance, and stable and reliable product quality. Mirror: round air valve adopts motor, beautiful and reliable operation, low failure rate, the material of the valve body is made of mirror, corrosion resistance, high-grade appearance. 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 energy-saving comfort and no noise. HVAC Air Duct Valve / Electric Air Duct Damper / Motorized Damper 125MM 220V Both the valve opening and the valve closing need to be energized, and the actuator will automatically shut off after completing an action. An action time is about 10 seconds. This damper is suitable for controlling the air volume from full flow to shut off The damper is constructed with polished stainless steel and come with aluminum valve plate It can work with thermostat, open and close automatically. colour: Silver Material: stainless steel size: Height: 19mm Outside diameter: 125mm Package Contents: 1* electric air valve Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.