Fresh air damper unit is generally not all switch valve, damper opening degree can not be adjusted to control the fresh air? A: The new air unit commonly used valve in three ways: 1, the electric control valve (electric open or closed, no air conditioning functions, often with the new air unit linked) 2,70 degree fire control valve (five-speed adjustment, inner duct air fire the temperature exceeds 70 degrees automatically shut down, the fan stops the chain introduced a new wind ventilators, often linked with the fire) 3, manual control valve whole new concept of energy-efficient heat recovery tech nano membrane technology and new wind ventilators later, the level of the reverse convection technology, anti- Electrostatic maintenance-free technology, application muffler technology, the new wind ventilators breaking the traditional heat recovery efficiency is generally low technological bottlenecks fresh air ventilation machine specifications, total heat recovery efficiency of more than 75%, a large exhaust energy recovery the magnitude of increase of new wind ventilators, the use of new wind ventilators, not only can reduce the total amount of air conditioning capacity and equipment hosts a one-time investment, the system can also reduce the overall operating costs of new wind ventilators specifications liter Swiss mechanical and electrical (certification), the new wind ventilators ventilation and air conditioning provided by the liter Swiss mechanical and electrical equipment factory. L Rui HVAC Electrical Equipment Factory (www.dzsrxfkt.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. In liters Swiss electromechanical leadership with the staff warmly welcome all inquiries negotiations to create liter Swiss electromechanical better future.