Fan commissioning, testing and runtime DK45 fan, you should confirm the same direction as the rotation direction of the fan impeller and fan in each case indicated by the arrows. Diffuser: You can recover some of the dynamic pressure, increase the fan static pressure ratio. FKZ fans, the main fan (certified), Liaoyang fan 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.