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 and long service life. It adopts bidirectional control and can be according to different requirements.High-quality valve leaf: The air valve leaf adopts high-quality aluminum plate stamping molding, equipped with silicone sealing ring, good airtightness, easy wear and corrosion resistance, and stable and product quality.Mirror: round air valve adopts high quality motor, beautiful and 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 220VBoth 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 offThe damper is constructed with stainless steel and come with aluminum valve plateIt can work with thermostat, open and automatically.colour: SilverMaterial: stainless steelsize: Height: 19mmOutside diameter: 125mmPackage Contents: 1* electric air valveOnly 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.