2. The new wind ventilators performance should meet the requirements of Table 1, the device corresponds to the nominal air flow heat exchange efficiency value of not less than the requirements of Table 2 of 3. In general, when a new air temperature of about -10 ℃, the exhaust side may appear frost, can be set up in front of the air preheater unit. 4. The device should be chosen to meet the relevant requirements of other standards and specifications. Three points to note the content of the calculation of fresh air room "public building energy efficiency design standards" GB50189-2005 design requirements for fresh air, make provision in clause 3.0.2, specifically, between 10-30m3 / (hop) between that there is fresh air 30m3 per person for the first hour. For indoor fresh air can be controlled by using the new system to operate air sensible heat fresh air ventilator, fresh air is mainly determined by means of GB / T18883-2002 standards referenced Ceiling fresh air ventilator, the standard advice is to use the recommended preparation department standard "Determination of fresh air indoor public places" detection method GB / T18204.18, but in the use of GB / T18204.18 process need to pay attention to several aspects of the problem, in order to ensure the accuracy of the measurement results. First, the choice of tracer gas, we think the most appropriate selection of carbon dioxide, on the grounds that carbon dioxide is a substance involved in the body's metabolism total heat fresh air ventilators, in human exhaled gases, carbon dioxide accounted for 4% -5% Meanwhile, the basic method is used in most countries. The method of execution GB / T18204.18 choose carbon dioxide as indoor air freshness indicators to calculate the mass balance principle fresh air. Its basic theory is the concentration of carbon dioxide in the detection space control in 0.1%, to ensure that there are 30m3 of fresh air per person per hour, while the choice of carbon monoxide as a tracer gas is a better choice. Secondly, with regard to the calculation method of the fresh air of new wind ventilators, standard GB / T18883 gives the average and regression equation method, using a box model, you can also use the differential method, the steady-state method for calculation. In practice, engineering test, in accordance with the standards, using non-linear regression method is the best choice, can accurately determine the value of the new wind system. Third, the gas concentration detector used to detect the sensitivity should be sufficient, in general, should reach the precise 0.01mg / m3 requirements. Texas fresh air ventilator manufacturers, rich ventilation equipment (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.