[Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - damper damper 280] should be normally open, also known as high-temperature fire dampers, typically installed in a high-temperature environment ventilation pipe flue damper, when After the temperature reached 280 fusible alloy melts, the valve is closed, but you can use the 24V control signals. If that is to be given electrical smoke damper 280 is normally closed damper, install the control center when the fire broke it open in the exhaust pipe exhaust smoke damper 280 when the temperature reaches the melting of the fusible alloy valves closed, the valve for a secondary operation. [Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - damper] ventilation and air conditioning engineering construction quality finished damper provisions are there? 1. The damper should be consistent with product specifications technical standards, and shall meet the design and use requirements; 2. The valve should open and close flexible, solid structure, the shell tight, corrosion good, smooth surface, no apparent injuries and deformation, and There should be no cracks, corrosion and other defects; 3. rotating parts inside the damper should be resistant, corrosion-resistant materials, the rotating mechanism flexible, reliable braking and positioning device; 4. valve flange and duct flanges should match. 280 ℃ damper | Tianjin Jinzhong Ji damper manufacturers (certified) | Tianjin Tianjin Jinzhong Ji HVAC dampers provided by purification equipment. Tianjin Jinzhong Ji HVAC purification equipment Limited (www.Jzjnt.com) is a leader in Tianjin, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the group leadership with the staff warmly welcome all inquiries negotiations to create a better future for the base.