Fire exhaust fan fan impeller is made of steel wheels hydraulic stretch forming, hydroforming press the blade, blade and hub assembly welding forming. The most important is that we should understand its impeller static and dynamic balance, balance accuracy is not greater than G5.6 level. In order to better meet the user's application requirements for fire exhaust fan flange of the outer cylinder flange with the overall spinning together, through our continuous improvement and tests to make them more value. In order to better meet the application requirements of customers, the HTF temperature exhaust fan the fire of the outer cylinder flange is made using whole flanged spinning, through our continuous improvement and tests to make them more value. This exclusive information is responsible for collating the www.dzjiaxing.com