In modern urban life, air pollution has become an important environmental problem threatening human health. According to the World Health Organization, 7 million people die every year from air pollution-related diseases. Indoor air quality is often worse than outdoors, with pollutant concentrations up to 2-5 times higher. As an effective solution to improve indoor air quality, fresh air system is becoming a necessary facility in modern homes.

First, the necessity of fresh air system
Urban air pollution is mainly caused by industrial emissions, automobile exhaust, construction, etc. PM2.5, formaldehyde, benzene and other harmful substances seriously threaten human health. The indoor environment is relatively closed, and it is difficult to effectively discharge pollutants such as volatile organic compounds released by decoration materials, carbon dioxide produced by human metabolism, and oil fumes produced by cooking. Fresh air system through continuous ventilation, can significantly improve indoor air quality, reduce the concentration of pollutants.

Studies have shown that the use of fresh air systems can reduce indoor PM2.5 concentration by more than 80%, maintain carbon dioxide concentration below 1000ppm, and effectively prevent respiratory diseases. For children, the elderly and other susceptible people, fresh air system is an important measure to ensure health.

Second, the scenario that the fresh air system must be installed
1. Newly renovated houses: harmful substances such as formaldehyde and benzene released by decoration materials take 3-15 years to completely volatilize. Fresh air systems speed up pollutant discharge and reduce health risks. It is recommended to choose equipment with sufficient air volume and high filtration efficiency, and continue to run for 3-6 months.
2. In areas with severe haze: in areas where PM2.5 concentration exceeds the standard for a long time, the efficient filtration function of the fresh air system can ensure indoor air quality. It is recommended to purify the function of the fresh air system.
3. Good sealed house: In order to improve energy efficiency, modern buildings generally adopt high sealed design, resulting in insufficient ventilation. The fresh air system can realize ventilation without opening the window and keep the air fresh. It is recommended to choose full heat exchange equipment to reduce energy loss.

4. Living environment for special groups: pregnant women, infants, the elderly and other groups are more sensitive to air quality. Fresh air systems provide clean air and reduce the risk of disease. It is recommended to choose a device with low noise and intelligent control to ensure a comfortable use experience.

Third, the selection and use of fresh air system
According to the size of the house to choose the appropriate air volume of the equipment, the recommended number of air changes in general residential is 0.5-1 times/hour. Replace the filter screen regularly, replace the initial effect filter screen 1-2 months, and replace the high-efficiency filter screen 6-12 months. Pay attention to the operating status of the equipment in daily use, and maintain it in time.
As an effective means to improve indoor air quality, fresh air systemis becoming a standard in modern families. It can not only provide clean air, but also adjust the indoor temperature and humidity to create a comfortable and healthy living environment. With the advancement of technology, intelligent control and lower energy consumption of fresh air systems will better serve people's healthy life.