Fan performance standards for: JB / T4296-1999 "mine axial fan" and Q / ZFJ010-2013 "FKZ series axial fan of mine." A motor vibration, rotor balancing failed. 2, the belt drive shaft hole eccentric or static equilibrium failed. 3, bent shaft extension. 4, foot-mounted loose. DK40 main fan K45 main fan, Zibo fan (certified), the main fan is provided by Zibo Blower Factory Co., Ltd. Zibo Blower Factory Co., Ltd. (www.zibo-fengji.com) is an industry leader in Shandong Zibo, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Zibo Blower leadership with the staff warmly welcome all inquiries negotiations to create a better future Zibo Blower.