Air-distribution device for motor vehicles

A motor-vehicle dashboard, comprising a plurality of outlet mouths for air and at least one air-deviator device comprising an inlet duct and a plurality of outlet ducts, and means for perturbation of the flow of air, said means of perturbation having more than one operating positions, in which they cause the deviation, by Coanda effect, of the flow of air coming from the inlet duct into a selected one of said outlet ducts wherein said means of perturbation comprise a fin forming part of a side wall of a chamber, into which the inlet duct gives out and from which there branch off the outlet ducts, said side wall, which carries the aforesaid fin being located right up against the mouth with which the inlet duct gives out into said chamber, the opposite wall of said chamber being, instead, set further away from said mouth, in such a way that, in a first operating condition, of said perturbation member (in which it does not project inside the chamber), the flow of air is deviated into a first outlet duct, which has a wall set on the prolongation of said wall carrying the fin, whereas, in a second operating condition, in which the fin projects into said chamber, the flow of air is detached from said wall that carries the fin and attracted towards the opposite wall of the chamber, with consequent conveyance into the other outlet duct.