In recent years, haze weather has brought unlimited business opportunities to the new wind industry. Compared with developed countries, the fresh air system entered the Chinese market late, which can be said to be an emerging industry emerging from the "haze". If the concept of "fresh air system" was mentioned five years ago, most people would shake their heads and say that they are not clear and understand it. But in this era of haze, the fresh air system is known as one of the most effective solutions to improve indoor air pollution, and its popularity is increasing year by year. The data shows that the potential of fresh air system in China's civil market is at least 168 million, and the potential consumption scale is as high as 1700 billion. In the future, the domestic fresh air market will continue to expand, and various relevant standards are also being formulated.