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Zalo
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1. This fan adopts advanced frontward open system,butterfly type,with two semicircle shutter doors, small wind resistance,good air-tightness and high efficiency. 2. The cone part adopts new design,plug-type connection. Bolts and nuts are used not so many as before, which reduced the intensity of labor. The appearance looks much more beautiful. 3. The belt tensioner device made of aluminum-magnesium alloy,long service life. This device make the belt inside tight up and effectively avoid the belt distortions in reverse direction to prolong the belt life ,saving cost. 4. Under the help of the rubber sealing ring , the two semicircle shutter doors close much more tight than before. Not all fans work, the air could pass through the interspace of non-working fans. This design could avoid this problem and ensure air pass through the evaporative cooling pads or air inlet only and greatly improve the fan efficiency,(compared with different type of same size,this fan increase efficiency 15-20%). 5. The fan motor is installed on the top left corner, which effectively protect it and avoid wind resistance.