Setting smoke damper in exhaust fan and exhaust pipe connections, not the end in the exhaust pipe set exhaust valves, exhaust valves and pay attention to the function smoke damper is completely different device. Exhaust valve usually normally closed, opened fire, and the control panel brand linkage exhaust fan, turn on the condition that an outbreak of fire alarm system (detector alarm), fire alarm host into automatic mode, exhaust valves open automatically linked row Smoke fan starts. Smoke damper is usually always open, but also turned a fire, but when the smoke temperature reaches 280 ℃, the exhaust damper automatically closes the exhaust fan manufacturers, the linkage has been opened fan stops running. For high-level underground chamber usually exhaust ventilation and Class 2 speed things work situation, two-speed electric ho different purpose still favorable. Switch to a low-speed two-speed fan runs fast, with a lot of ho enhance speed exhaust fan installed wind row also corresponds greatly enhanced, when the system becomes immediately by the exhaust smoke Yi situation. However, in the planning process, and we will meet the electrical control of two-speed fan problem, basically speaking from how to deal with the motor windings Δ connection Y connection to double conversion and interlock, fire linkage of self-control and manual; Fans in the fast circulation of defense down, and how to ensure the maximum level of credibility do smoke, how to ensure the power supply and other problems. Following on as part of the two-speed fan control discussions. As far as we designed several projects in recent years in terms such as Tian Mu Road Shanghai Railway Bureau electronic dispatch building exhaust fan, the building a total of 16 floors, basement (about 2000m2) for the parking garage. We consider the mechanical design and mechanical exhaust smoke, which set outlet in every stairwell, front room and other parts, by pressurized air supply fan, to form a positive pressure to prevent smoke intrusion, to ensure the safe evacuation . Set exhaust valves, the roof or the wall near the ceiling set in the pipe exhaust port, the high temperature flue gas exhaust smoke machine outdoors. And in the case of a large area with a smoke partition, just behind where the smoke detector smoke alarm smoke partition. This is to prevent any expansion of the scope of smoke, causing smoke and fire spread. Otherwise, not only affect the smoke effect, but also may be due to high temperature flue gas led to the non fire sprinkler nozzle rupture site and indiscriminate spraying, affecting both the fire effect, and cause unnecessary damage. Exhaust fan Wu Cheng, Chen Yu-conditioned patented product (certified), exhaust fan by Wu Cheng Chen-yu air-conditioning Limited. Wu Cheng Chen-yu air-conditioning Co. (www.wccykt.com) is an industry leader in Shandong Dezhou, fans, ventilation equipment, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Chen Yu-conditioned in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu air conditioning better future.