Where does the car's external air circulation intake come from?

[VanAlan]

The air that enters through the car's air conditioning intake is the external circulation air. The air conditioning intake is located below the center console and the front windshield. Due to obstruction by other components, it is not easily visible. External circulation draws outside air into the car, maintaining air freshness inside and providing a comfortable environment for passengers. When driving on construction sites or in tunnels, it is recommended to use internal circulation. Using external circulation in these situations would allow polluted outside air to enter the car, affecting the interior environment. Additionally, during peak commuting hours with heavy traffic, it's best to use internal circulation as well, since traffic congestion produces significant exhaust fumes that could enter the car through external circulation. For long-distance driving, it's generally advisable to switch to external circulation for ventilation after about one hour of driving. Prolonged use of internal circulation may cause discomfort or even oxygen deprivation for both the driver and passengers. When the outside environment is clean, external circulation can be used to maintain good air exchange between the interior and exterior.