Exhaust fans axial fans: air flow along the axial movement of the fan impeller. Centrifugal fan total pressure is large, the motor isolated from the hot gas fumes. Not easily damaged. Small axial fans, in general, to go through the hot gas fumes exhaust fan motor HTF-1, easy to damage. Kitchen generally recommended to use a centrifugal fan. Centrifugal fans and former stars to the multi-leaf impeller and backward impeller. Comparison to the front wheel and rear wheel advantages :() opt for a lower speed (low noise), smaller diameter can get a larger air volume total pressure. Forward impeller disadvantages: low efficiency, high energy consumption, easy cleaning cleaning. After the impeller advantages: high efficiency, energy saving, easy cleaning cleaning. After disadvantage compared to the impeller to the impeller) to be given equal air flow and total pressure required for high speed (and therefore noise), and a larger diameter front :(. Exhaust fan performance 'regulatory exhaust fan fire, is to let the wind pressure or wind turbines achieve a standard of fans artificially controlled. Through effective regulation, allowing high pressure air blower in ensuring the stable operation of the conditions necessary to meet the production requirements for flow or pressure but also to maximize energy savings. Although users will adopt different regulatory approach exhaust fan, but achievable goal is the same JGF exhaust fan fire, but the effect is there are some differences. Select the adjustment method is not only related to the effect of exhaust fan fire, more fan energy savings will have a huge impact, so choose an appropriate adjustment method to keep fans on the premises to achieve the same effect of energy-saving effect. The only way to improve the efficiency of the fan, to achieve energy efficient, but also to better protect the fans, to extend efficiency. Prominent feature is the vertical exhaust fan fire exhaust fan such performance, its effect is that these energy-efficient, we must be in accordance with the above instructions for proper operation, to obtain better results. Two-speed exhaust fan is increasingly used in high-level basement, garage ventilation exhaust work, then the installation must pay attention to the normative wiring method, the size of today tells you what knit two-speed fan Connection: Large two-speed exhaust fan wiring methods: In general, the distribution of electrical power in the following 4KW Y wiring; 4KW or more (including 4KW) △ connection. Large air-conditioned two-speed fan of the group with double speed motor stator winding is △ / YY (or Y / YY) connection. Two-speed exhaust fan control principle: The Company two-speed fan motors which are equipped with double quick set stator windings △ / YY (or Y / YY) connection, the connection speed by changing the basic principles of the method of stator windings, so which changes the number of poles in order to achieve the purpose of speed, low-speed work for △ (or Y) method; high-speed operation mode when YY. Wind the electrical control box with circuit breaker, protection devices and other electrical components, according to the fan must be properly reasonable matching the rated capacity. Fire exhaust fan | Chenyu air conditioning (certified) | Xingtai exhaust fan by Wu Cheng 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.