Means for ventilating air in a cabin of a motor vehicle

Means for ventilating air in a cabin (1) of a motor vehicle, comprising: - a housing (5) having a first inlet opening (6) for outside air, a second inlet port (9) for air from the driver's cabin and an opening into the cabin outlet port (12) for air flowing through said inlet openings into the housing arrives, - a fan (11) from which a low-pressure side is connected to the intake ports and an overpressure side is connected to the outlet port in order to suck air through the inlet openings into the housing and blow the air through the outlet opening in the driver's cab, and having a specific for closing and opening of the inlet openings assembly means (20-25), which are capable to allow, starting from a fully open state of the first intake port, an initial closing of this first intake port (6), and adjusting the degree of opening of this - to allow inlet port, while the second inlet opening (9) is kept closed, said arrangement ...