Two-speed exhaust fan used in high-rise building fire in the exhaust system for the high-level basement usually work status exhaust smoke accident two-speed, two-speed asynchronous motor is particularly suitable. Two-speed fan running at high speed into a low-speed, synchronous speed improve a lot, the exhaust volume greatly improved accordingly, then the system immediately replaced by exhaust smoke condition. But in the design process, will encounter Electric two-speed fan control problems, that is how to solve the motor windings from Δ connection Y connection to the double conversion and interlocks, fire linkage automatic and manual control; fan In high-speed operation and reliability of the protection shutdown how to maximize the protection accident smoke, how to ensure that the power supply and other issues. As far as we designed several projects in recent years, in terms of, as Tianmu Road Shanghai Railway Bureau electronic dispatch building, 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 the stairwell at each outlet, front room and other parts of the pressurized air through the fan, to form a positive pressure to prevent smoke invaded the kitchen exhaust fan, to ensure the safe evacuation. Set exhaust valve exhaust fan, ceiling or wall near the ceiling set in the pipe exhaust port, the high temperature flue gas exhaust smoke machine outdoors. And has a large area where smoke partitions, just behind where the smoke detector smoke alarm smoke partition. This is done to prevent any expansion of the scope of smoke exhaust fan fire brand, resulting in the proliferation of fireworks. Otherwise, not only affect the smoke effects, but also may be due to the high temperature flue gas sites attracted non-automatic fire sprinkler spray nozzle rupture and chaos, it will affect the fire effect, and also causing unnecessary damage. Exhaust fan operation | Laizhou exhaust fan | Chenyu quality wholesale air conditioning provided by Wu Cheng Chen-yu air-conditioning Limited. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chenyu air conditioning and you hand into the brilliant, for a better future!