What are the functions of air recirculation?

[DeJourney]

Here is an introduction to the functions of air recirculation: 1. Thermal insulation effect: In recirculation mode, the airflow channel between the inside and outside of the vehicle is closed. Without the fan, there is no airflow circulation, and when the fan is turned on, the inhaled airflow only comes from inside the vehicle, forming an internal airflow circulation. Recirculation mainly prevents external dust and harmful gases from entering the vehicle in a timely and effective manner, such as when driving through areas with smoke, dust, odors, or in heavy traffic, blocking harmful exhaust emissions from the vehicle ahead. Recirculation can enhance the cooling and heating effects of the air conditioning system and provides good thermal insulation. 2. Rapid temperature increase: In cold weather, after getting into the car, wait for a moment until the engine temperature reaches the normal level. Then, turning on the heater in recirculation mode can quickly raise the temperature.