Fan motor wiring main fan must be correct to ensure the cable connection and terminal maintenance fastening main fan, fans must be grounded. Forced ventilation because it is a positive pressure ventilation fan is stopped once the main fan selection, underground air pressure will drop DK45 main fan gas emission will increase security threats are usually disabled. Maintenance _K40 main fan impeller (certified) _ Taian main fan by Zibo Blower Factory Limited. 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.