1. centrifugal fan wind chassis, the required motor power refers to conditions to be determined, together with the proper mechanical losses in terms of reserves, not the required full power outlet, such as the fan outlet is not connect pipes or adding external resistance and empty running, the motor has burned up the risk of exhaust fans, for safety reasons, the valve should be added at the fan outlet or inlet line, starting the fan off, running after the valve Slowly turn, is reached specified conditions, and pay attention to fan current exceeds a predetermined value. 2. Allow full voltage starter or fan voltage starting fire exhaust fan model, but it should be noted that the current full voltage starting 5 to 7 times the rated current, voltage starting torque is proportional to the square of the voltage, when the network capacity insufficient, you should start a buck. (When the power is greater than 11KW, should buck starter). Two-speed fan control principle: The company two-speed fan motors are equipped with two-speed electrical stator windings △ / XY (or Y / XY) exhaust fan speed by changing the basic principles of connection between the motor stator windings to changing the number of poles in order to achieve the purpose of exhaust fan speed control box, low-speed operation △ (or Y) mode, XY mode for high-speed operation. The electrical control box with wind breakers, protective devices and other electrical components, the rated capacity of the fan must be a reasonable choice right price kitchen exhaust fan, exhaust fan White City, Chen Yu-conditioned factory outlets by Wu Cheng Chen Yu Air Conditioning Equipment Co. The company offers. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chenyu air conditioning and you hand into the brilliant, for a better future!