A fresh air system is a device or system designed to improve indoor air quality. By providing fresh, filtered air to the room and at the same time removing the dirty air from the room, the fresh air system helps to maintain the fresh and healthy air in the room. Although the fresh air system has been widely concerned and applied in the world, there is still a significant gap between the domestic and foreign perceptions and applications.

First, foreign cognition and application of fresh air system

In foreign countries, fresh air systems have been widely used and recognized. This is mainly due to its advanced scientific and technological level and environmental awareness. In many developed countries, fresh air systems have become the standard configuration in new buildings and decoration projects. It is widely believed that fresh air system is an important means to improve indoor air quality and ensure healthy life.
In foreign homes and business places, fresh air systems are widely used in the following aspects:
1. Ventilation: The fresh air system can effectively discharge the indoor dirty air and introduce fresh air at the same time, so as to keep the indoor air fresh.
2. Air filtration: Fresh air systems are usually equipped with efficient air filters, which can filter out harmful substances such as dust, pollen, and bacteria in the air to provide people with a healthy indoor environment.
3. Energy saving and environmental protection: Through reasonable control of the operation of the fresh air system, energy consumption can be effectively reduced and the impact on the environment can be reduced.

Second, the domestic recognition and application of fresh air system
Compared with foreign countries, the recognition and application of fresh air system in China is still in its infancy. Although in recent years, with the continuous improvement of people's attention to indoor air quality, the application of fresh air system is gradually popularized, but there is still a big gap compared with foreign countries.
In China, the application of fresh air system is mainly manifested in the following aspects:
1. Construction field: In the newly built residential and commercial buildings, some areas began to promote and apply fresh air systems. But overall, the popularity is still low.
2. Medical, education and other special places: in some medical, education and other special places, due to the high requirements for indoor air quality, the application of fresh air system is relatively more.
3. Consumer cognition: Although more and more people begin to pay attention to indoor air quality, the cognition of fresh air system is still in the initial stage, and many people lack a deep understanding of its role and principle.

Third, analysis of the reasons for the gap

The main reasons for the gap between domestic and foreign fresh air systems are as follows:
1. Difference in scientific and technological level: foreign countries have a higher level of development in building technology and environmental protection technology, which provides strong support for the popularization of fresh air systems. The domestic development in related fields still needs time.
2. Insufficient policy support: Although the government has begun to pay attention to indoor air quality in recent years, it still needs to strengthen policy support and standard setting.
3. Lack of consumer awareness: many consumers have insufficient understanding of the importance of indoor air quality and insufficient understanding of fresh air systems, resulting in a lack of enthusiasm in the application of fresh air systems.
Iv. Conclusions and Recommendations
In order to narrow the gap between domestic and foreign fresh air systems, we need to start from the following aspects:
1. Improve the level of science and technology: strengthen the research and development and application of building technology and environmental protection technology, and provide technical support for the popularization of fresh air systems.
2. Strengthen policy support: The government should increase policy support and capital investment for fresh air systems, and promote their popularization in new construction and decoration projects.
3. Improve consumer awareness: through publicity, education, popular science activities and other ways to improve consumers' attention to indoor air quality and understanding of fresh air system, stimulate their enthusiasm for the application of fresh air system.
4. Promotion of successful cases: Through the promotion of successful application cases of fresh air system at home and abroad, more people can understand the role and advantages of fresh air system, and promote its popularization and application in China.

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