In P ~ Q characteristic curve is a curve gives a number of mounting angle DK40 every fan, but in fact each mounting angle (30 o, 31 o, 32 o, 33 o, 34 o, 35 o, 36 o, 37 o, 38 o, 39 o, 40 o) can be selected. Therefore, the required fan mounting angle should point in the process to determine the specific location. In order to facilitate the main ventilation system fan site commissioning, we should choose the operating point close to the maximum or minimum installation angle of the fan. FBCD series of mine explosion out of rotating axial local fan composed by two hosts work, two rotated in the opposite direction of the impeller. That is an impeller rotates clockwise, counterclockwise rotation of the impeller two K40 fan impeller blade number two mutually prime. Air energy obtained from stage impeller wheel after two booster sent. In addition to increasing energy impeller secondary airflow, but also both axial fan in general static vane fan function at the same time get the entire guide straight circumferential direction velocity component FKZ fans, streamline air impact, increasing the air flow energy, reduce a wake vortex, reducing noise. K40 fan _ mine safety certificate (certified) _ Lianyungang 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.