Vent pipe is not in use when the fire damper to close 70 degrees role play to prevent the spread of fire. Exhaust damper system is in Wuhan fire is smoke dampers purchase, the higher the flue gas temperature to 280 degrees, the fire has reached not by mechanical ventilation effect Wuhan fire dampers, exhaust valve closes to prevent fans and other equipment damage. 70 normally open normally open fire. A fire close. 280 NC fire smoke, a fire fight began to open when the exhaust air stream 280 is closed. Smoke control system, it is made supply and exhaust pipes, tube wells, fire dampers, door switch equipment, delivery, ventilation and other equipment. Smoke control system set up in the form of pressurized stairwells. The amount of smoke mechanical exhaust systems and smoke partition has a direct relationship. High-rise buildings against smoke should smoke into the pressurized air supply facility and can be opened outside the window of natural ventilation facilities. High-rise buildings should be divided into mechanical exhaust facilities and exhaust facilities opened outside the window of natural ventilation facilities. Wuhan damper manufacturers | Wuhan Han Wei Li Yuen (Online) | Wuhan damper provided by the well-being of Equipment Co., Ltd. Wuhan Han Wei Li Yuen. Wuhan Han Wei Li Yuen-being of Equipment Co., Ltd. (www.whhwly.com) is a leader in Wuhan, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customers needs. In Wuhan Han Wei Li Yuen leadership with the staff warmly welcome all inquiries negotiations to create Wuhan Han Wei Li Yuen better future.