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How Long Does It Take to Feel Oxygen Deprivation When Using the Car's Recirculation Mode?

1 Answers

LeRylee

07/30/25 8:34am

Generally, it takes about 2 hours. If the recirculation mode is used for too long, you may feel stuffy, and it's time to switch to the fresh air mode to let in outside air. Here are some related details: Recirculation Mode: The recirculation mode closes the airflow passage between the inside and outside of the car. Without the fan, there is no airflow circulation. When the fan is on, the airflow drawn in comes only from inside the car, creating an internal airflow cycle. The recirculation mode mainly prevents external dust and harmful gases from entering the car, such as when driving through smoke, dust, areas with strong odors, or in heavy traffic, blocking harmful exhaust from the vehicle ahead. Another function is to maintain temperature. Combined Usage: The use of recirculation and fresh air modes should be combined with the air conditioning and heating system. Using the fresh air mode allows you to breathe fresh outside air. During long highway drives, if the air inside the car feels stale and uncomfortable, and you can't open the windows, you should switch to the fresh air mode to let in some fresh air. In winter, if the heating feels too warm, you can turn off the fan and switch to the fresh air mode to maintain the interior temperature while getting fresh air, which will feel more comfortable.

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