"Cross Flow Fan" fan uses determines the performance, and performance is determined by the manufacturer, so cooling fan use is the selection factors to consider in the first place. The state of the cooling fan and cooling fan conveying gas use is directly related to the physical condition of different gases and chemical properties, the type of fan used are also very different. If the cooling fan gas transport flammable, explosive characteristics, will have to choose explosion-proof fan; cooling fan gas delivered if it contains a lot of dust or transporting coal, to choose dust, dust emission, coal cooling fans; gas cooling fan to be delivered when a relatively strong corrosive, anti-corrosion to select cooling fan; work or conveying high temperature gas at high temperatures, to select high temperature cooling fan.