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- Plano, Texas, USA
Open/Close Dial Control on Center Dash Vents
Both VW Passat and BMW 528i of ours have this open/close dial control on center dash vents. This should mean there's no different regulation in the US.Its a safety issue and I think regulations require some airflow. This is especially important if the rear door is not sealing properly or left open as engine exhaust will flow back into the vehicle. Ever notice how quickly the rear door gets dirty? The road dirt/exhaust naturally flows back against the rear.