What are the functions of the car's internal circulation?

[Jimmy]

The function of the car's internal circulation is to close the airflow channel between the inside and outside of the vehicle, forming an internal airflow circulation. It can effectively and promptly prevent external dust and harmful gases from entering the car and maintain the internal temperature. The method to use internal circulation is: press the corresponding button to switch the air conditioning mode to internal circulation. The differences between internal circulation and external circulation are: 1. Different air circulation methods: internal circulation draws air from inside the car; external circulation draws air from outside the car, and after the air conditioning system cools or heats the air, it blows out from the air conditioning vents. 2. Different functions: internal circulation effectively prevents external dust and harmful gases from entering the car and can improve the cooling and heating effects of the air conditioning; external circulation draws fresh air from outside into the car to maintain the air quality inside the vehicle.