ventilation: Ventilator is one of necessary foundational structures in modern buildings. It has lots of functions like ventilating, increasing pressure, discharging fume, breathing and so on. We can manufacture steel and FRP 2 kinds of fan. The steel fan includes YTPY series fire fighting high-temp fume extractor, SJG series diagonal-flow blower, YTHL series mixed-flow fan, YTCZ series axial-flow fan and 4-72-12 series centrifugal fan and so on. This kind of fan has many features like flat efficiency curve, advanced structure, low noise, simple installation, reliable running and others, it can meet the requirements of special working condition. The FRP fan is co-developed by the Air Conditioner Academy of Chinese Foundational Architecture Institute, the Huabei Electric Power Institute of Chinese Electric Power Ministry and us. This kind of fan includes T35 series axial-flow fan, 4-72-12 centrifugal fan, SJG diagonal fan, YTCG pipeline blower, YTBZ wall mounting fan and YDTW, BDW-87-3, BDW-87-4, WS-85-6 series rooftop fans. It is made from fine resin, and adopts the spray painting outer skin of an American MIZUSHI company. This kind of fan has many features like stable physicochemical performance, less fading, light, corrosion proof, anti aging and etc. Its life time can easily surpass 30 years.