Traditional Culture Encyclopedia - Photography major - Why does the internal circulation automatically open when the red flag H 5 is engaged in reverse gear?

Why does the internal circulation automatically open when the red flag H 5 is engaged in reverse gear?

This is to ensure the fresh air in the car.

The picture of Red Flag HS5 in the online car market is provided by professional photographers, as well as the overall appearance and body details of Red Flag HS5.