What is the purpose of the air vents under the seats?

[AaliyahAnn]

Seat under the air vent is the air conditioning outlet, the specific information is as follows: 1, rear air conditioning outlet at the foot: on the one hand, the cost problem is considered, on the other hand, some models are used to set the difference between high and low configuration. 2, air conditioning outlet: the industry called the rear foot blowing outlet. It is to warm the feet of the rear row when heating and blowing the feet, because the hot air rises. The rear row design wind speed has requirements, based on human comfort and pipeline layout requirements as the premise. 3, car air conditioning principle: most car air conditioning heating is by the engine waste heat, that is, the temperature of the coolant in the water tank to heat. The car AC control button controls the air conditioning compressor, the car air conditioning does not have a four-way valve, so it can not achieve heating like home air conditioning.