The position of the air outlet is basically hidden and difficult to see with the naked eye. In addition, it is usually designed on both sides of the trunk, also known as compression holes. Generally speaking, the decoration of the trunk will block the position of the air outlet. Of course, this is mainly for aesthetics. However, we may find it when we open the decorative board or sound insulation pad. As for the engine flameout, or the engine flameout, how about the ventilation of the car? Strictly speaking, today's engines are usually in an external circulation state when they are turned off. In this case, fresh air from the outside will enter the car through the air inlet of the air conditioner, and the air outlet will also enter some air. So even if the doors and windows are all closed, the people in the car will not suffocate.
When the doors and windows of the car are closed, the air in the car flows slowly. With the breathing of people in the car, the concentration of carbon dioxide increases, which will have a certain impact on the health of people in the car. So when you sleep in the car, you'd better lower the window glass, so that the air in the car will flow faster, so that you can ensure the air is fresh. However, it is best not to stay in this closed space for a long time.
As long as there is natural wind outside the car, the air can still be slowly exchanged with the air inside the car at the gap between the doors of the car, the interior panel of the air conditioning system, the wire harness cover of the pipeline, etc. This is also the reason why vehicles with stable positions will not have problems in a short time. If there are too many people in the car, the possibility of carbon dioxide poisoning cannot be ruled out. Many vehicles use internal circulation for long-distance driving, running continuously 1~3. This is not because of fatigue, but because the concentration of carbon dioxide in the car is too high. At this time, the window is ventilated, and it is not the cold air that stimulates the nerves, but the oxygen in the fresh air that gives the brain "source power".
When resting in the car, try to choose a position with good air circulation. Windows or skylights can be properly gapped to ensure the exchange of air inside and outside. The airflow intensity should be determined according to the number of members in the car, and the influence of altitude on the oxygen content in the air should be considered. For example, the oxygen content in plateau air at 4000 meters is actually only about 12.5%, and the calculation needs to be recalculated.