In the summer, air conditioning helps the car to help passengers quickly cool down. But for the standard 5-passenger sedan, the air conditioning vents are generally arranged in the center console. Such an outcome could lead to rear passengers can not enjoy the cool air quickly. And when cold air is too large, front passenger and some will feel uncomfortable. By this time, the rear passengers may still feel more heat. For such a hot and cold uneven demand contradiction, is equipped with a rear-seat air outlet is more realistic solution. Not only help the whole car passengers can enjoy the air conditioning of care. And, where necessary, can be closed even after the front passenger demand ejection outlet or the air conditioning vent to meet different physical alone. When combined with air conditioning and automatic temperature control for use with the partition, then the effect will be better. Now back seat vent is not a joint venture high-end models of patents, many of the low-cost models are also equipped with independent rear seat air conditioning vent.