See also:

Center ventilators
Center ventilators Move the tab to adjust the flow direction. ...

For U.S.A.
The following information has been compiled according to Code of Federal Regulations “Title 49, Part 575”. ...

Defrosting or defogging the windshield
Defrosting or defogging the windshield To direct warm air to the windshield and front door windows: 1. Set the airflow control dial to the “” position. 2. Turn the temperature control dial all the ...