The ventilation device (1), especially for a motor vehicle, has an air filter (2) formed by two members (3) located at an angle to each other of no more than 90 degrees. The two members are constructed asymmetrically with regard to their length. The length...

The system has an electric circuit with a supply source (42), a main switch, and a speed variation module (48) to selectively deliver a supply voltage to a pulser (4) based on speed selected by a control board (46). A commutation circuit (51) permits the c...