Principle II: determine the minimum amount of exhaust inside the housing to meet people's daily work, the amount of fresh air needed rest. According to national norms Jiangxi ventilation air ventilator, 30 cubic meters per person per hour must ensure, or a new air changes per hour wind ventilators, whichever is greater. The new wind ventilators main technical parameters: ① way ventilation: it determines the size of the ventilation or air changes, common units: m3 / h. Ceiling fresh air ventilator unit ② residual pressure: its size determines the distance to overcome the resistance of the air, or the ability to access new wind ventilators, common units: Pa. ③ Noise: Common Unit: dB (A). ④ Power: determines the size of the power consumption of the unit: W or kW. ⑤ heat transfer efficiency: the ratio of the reaction heat recovery unit or efficiency, unit:%. ⑥ structural parameters: the dimensions and installation / fitting dimensions, it is subject to restrictions on the installation conditions. Beijing's new wind ventilators, ventilation equipment Plumper (certified), fresh air ventilator provided by Dezhou Plumper ventilation plant. Dezhou Plumper ventilation plant (www.frtfsb.com) is a 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.