Exhaust fans are smoke control system in the fire protection system, which is generally linked with the fire alarm host. Setting smoke damper in the exhaust fan and exhaust pipe connections, set the exhaust pipe is not the end exhaust valves, exhaust valves and smoke damper attention is entirely different device functions. Exhaust valve usually normally closed, opened fire, and alarm host linkage, automatic alarm system is turned on condition that a fire broke out (detector alarm), fire alarm host in the automatic state kitchen exhaust fan, exhaust valves open automatically linked row Smoke fan starts. Smoke damper is usually always open, but also turned a fire, but when the flue gas temperature reaches 280 ℃, the smoke damper automatically turn off the exhaust fan, the linkage has been opened fan stops running. As we all know, a large amount of smoke and hot fire, and consume large amounts of oxygen. On its hazards, particularly at night to smoke exhaust fan operation, the smoke contains many toxic elements, even though non-toxic, can also lead to hypoxia due to combustion suffocating to death. Every fire accidents in burned persons, most are also the first to be smoked fainted before being burned to death when a fire smoke spread fast, level up to 0.5-0.8m / s, vertical up to 6-8m / s. In the fire, the one extinguishing fire exhaust fan model, then a smoke control. Is off the fire extinguishing, broken smoke source, smoke control system was to provide safe passage to escape, and to facilitate the initial fire; smoke control system is referred to as the smoke and smoke two parts. To today's high-rise buildings at the same height, but also the depth of space development, underground development, and in the basement of high-rise buildings, the smoke control system is very important. Design units, we should pay attention to prevention in the design, exhaust design. Kitchen exhaust fan, air conditioning Chenyu varieties (certified), roughness exhaust fan provided by Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) is a leader in Dezhou, 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 . Chen Yu-conditioning in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu conditioning a better future.