Fans can be divided according to use divided: axial fan, Francis fan, roof fans, air-conditioning fan and so on. Low pressure can be divided according to the fan blower, the pressure blower, high pressure air. Fan performance parameters are mainly flow, pressure, power, efficiency and speed. In addition, where the sale of axial fan, noise and size of the vibration is also a major fan design specifications. Also known as the air volume flow rate, flow through the fan to the gas volume per unit of time expressed; pressure, also known as pressure means a pressure rise within the gas turbine, there is static pressure, dynamic pressure and total pressure points; power is the fan input power, i.e., shaft power. And effective power turbine shaft power ratio is called the efficiency. DWT series roof fan features a specification form, a wide range of applications: according to different occasions and require the use of wind, pressure and noise, use the following three types of fans: A, Axial roof fan: Model for the DWT-I type, suitable for low-voltage, high-volume usage scenarios. According to user needs can also be designed to deliver two-way reversible exhaust, which has both positive and negative characteristics of the fan equivalent conditions, DWT-Ⅴ type such as; B, centrifugal roof fan: Model for the DWT-Ⅱ type, DWT-Ⅲ type two types of axial fan manufacturers, apply a small amount of wind and pressure requirements of the occasion; C, no motor turbine exhaust fan: Model for the DWT-Ⅳ type, is an indoor and outdoor air pressure driven by special curved blade with the axis of rotation so as to discharge the ideal energy-saving ventilation of indoor air. 2, where high efficiency axial fans, low noise: The fan uses advanced CAD software, designed by the multi-objective optimization. DWT-Ⅰ series machines No. 12 # -24 # A total of eight machines No. fans, by changing the speed, angle and leaf-type methods, the expansion of the range of performance parameters to meet the needs of different conditions of use, to the fan with the system area with axial fans, in order to facilitate energy saving and noise reduction; 3, smooth operation and long life: a small moment of inertia of the fan, high-precision dynamic smooth, stable operation, and within the standard requirements of the modern enterprise performance indicators are high in the fan industry standards to ensure that the fan at the leading position in the peer; 4, wide application: This fan can be used according to requirements made into explosion proof, for flammable, explosive and corrosive gases occasions forced ventilation ; 5, the products on many occasions by the provinces and Technical Supervision qualified, users can be assured. Axial fans where the good, Hao Yang air conditioning equipment (certified), axial fans are provided by the Texas Air Conditioning Equipment Co., Ltd. Hao Yang. Air Conditioning Equipment Co., Texas Hao Yang (www.dzhykt.com) is Dezhou, chemical fiber fabric, lining leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Hao Yang air conditioning equipment in leadership with the staff warmly welcome all inquiries negotiations to create Hao Yang air conditioning equipment a better future.