1. centrifugal fan wind chassis, the required electrical power is the condition to be determined, together with proper mechanical loss reserves, it is not the required full power outlet, exhaust fan port, such as the fan outlet duct is not connected or add external resistance and empty running, the motor burned danger, for safety reasons, the valve should be added at the fan outlet or inlet pipe, closed at the start fan operation after slowly open the valve, is reached a predetermined condition, and pay attention to fan current exceeds a predetermined value. 2. The fan allows full pressure start or step-down start, but it should be noted that the current full voltage starting time of 5 to 7 times the rated current, voltage starting torque is proportional to the square of the voltage, when there is insufficient grid capacity, should be used voltage starting. (When the power is greater than 11KW, should adopt the step-down start). 1.HTF-Ⅰ, HTF-Ⅱ represents pressure type fire temperature exhaust fan, exhaust fan size, airfoil axial flow type: HTF-Ⅰ (single speed) and HTF-Ⅱ (double speed) of two; HTF-Ⅲ, HTF-Ⅳ representation pressure fire temperature exhaust professionals; 2, HTF-X as a silencer fire temperature exhaust fan, the user can choose according to the actual needs of different kinds; 3, HTF-W Series Roof Fire temperature exhaust fan, the user can choose according to actual needs retardant fiberglass hood or steel hood; 4, HTF-D as a low pressure type fire temperature exhaust fan; 5. Special note: GYF HTF series fan with similar products ??? Performance exhaust fan; fire exhaust fan, said during use, the exhaust fan offer, not only to make the appropriate use and maintenance work, and to its performance fully displayed, and improve the efficiency of the fan, so as to increase Its range of applications, the majority of user acceptance. So we should make energy-efficient exhaust fan fire effect on how full performance of it, today as we detail below: For some relationship between the different flows, we adjust the way is also divided into several different approaches that adjust the way little effect on energy savings, even not only energy saving, but because of presence of a regulatory apparatus more power consumption. Variable-speed control curve closer to the ideal curve. Therefore, the variable-speed control mode is superior, especially the use of variable frequency motor speed control of energy-saving program is the best, but the need for additional frequency devices. Exhaust fan selection | Chenyu air conditioning (certified) | exhaust fan port city by Wu Chen-yu air-conditioning Limited. Wu Cheng Chen-yu air-conditioning Co. (www.wccykt.com) is an industry leader in Shandong Dezhou, fans, ventilation equipment, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs ??? Chen Yu-conditioned in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu air conditioning better future.