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A fresh air system is a ventilation system that improves indoor air quality and creates a healthy living environment by introducing fresh outdoor air and discharging polluted indoor air. It consists of a fresh air supply port, an air inlet pipe, a filter, an air exchange or a fan and an exhaust outlet. The working principle is to automatically or manually adjust the amount of fresh air in the room according to the indoor air quality requirements. The fresh air is introduced into the room through the filter, and the indoor polluted air is discharged through the air exchange or fan. The application of a fresh air system can effectively remove the pollutants in the indoor air and provide a comfortable and healthy living environment.