How to turn the interior of the car into negative pressure

Open the 2-3 finger unilateral front window. This method can form a negative pressure state inside and outside the car. Because the wind speed outside the car is greater than that inside the car, and the air pressure is small, the air inside the car will be exhausted.

The invention relates to a device for generating and/or amplifying negative pressure in an automobile, in particular to a device for operating a negative pressure-braking force amplifier, which comprises a throttling unit.