1. The choice of the control parameters for wind chassis air flow, total pressure, efficiency, noise, and electrical power. There are centrifugal and axial flow. 2. The fan since the wind chassis, muffler favor. 3. When the fan selection should consider piping system leakage losses calculation error fresh air ventilator efficiency, as well as the negative deviation fan actual wind, air pressure, the general air volume of 1.05 to 1.1, pressure of 1.10 ~ safety factor of 1.15. But not using too Daxin wind ventilators to prevent long-term fan running at low efficiency area. 4. Note the pipe resistance characteristics matching networks and fan characteristics. For the stable operation of the fan, the fan should be made to work in the vicinity of its maximum efficiency point, the operating point of the fan performance curve to the right of the peak point of the total pressure (ie, the amount of side winds, and generally all-pressure peak of 80% ). The difference between the new wind ventilators and ventilator or exhaust fan: The fan or exhaust fan only the limited outdoor air into the room, but not on the old air heat exchange. In this case, the summer and winter use fan or exhaust fan Nanjing new wind ventilators, will bring to bear the burden borne by indoor heating or air conditioning to cool; large fan or exhaust fan noise, it is impossible in the bedroom (especially children room, old house) mounted fan; fan or exhaust fan is not air filter will cause indoor dust or respirable particulate matter pollution intensified. The new wind ventilators ventilation equipment manufacturers _ Plumper (certified) _ fresh air ventilator provided by Dezhou Plumper ventilation plant. Dezhou Plumper ventilation plant (0) is the leader in Dezhou, fans, ventilation equipment, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Rich ventilation equipment in leadership with the staff warmly welcome all inquiries negotiations to create rich, ventilation a better future.