1. The fresh air system of air conditioning is one of the three major air circulation systems of air conditioning, namely indoor air circulation system, outdoor air circulation system and fresh air system. The main function of fresh air system is to realize circulating ventilation between indoor air and outdoor air, and also to purify the air. Indoor polluted air is discharged to the outside through the fresh air system pipeline, forming indoor and outdoor air pressure difference, thus completing indoor and outdoor air exchange and refreshing the air. Centrifugal fans are widely used in minicomputers, and axial fans are generally used in central air conditioners.

2. Take fresh air conditioning as an example. Does this product increase oxygen through fresh air? System, purifying outdoor oxygen-enriched air and introducing it into the room to ensure that the indoor air is clean and fresh; TM technology of healthy air adopts eight-character partition air supply, which realizes the slow descent of cold air from the ceiling and avoids direct blowing on the head. Warm air is sent to the floor, and heat starts from the feet.