The device has a turbine (2) sucking air through an evaporator (1) to blow the air towards a central jet (3). An external (4) and internal (5) air inlet is arranged in a roof (6) of a vehicle and a suspended ceiling (7) of the vehicle, respectively. The air inlets are arranged in a space delimited between the roof and suspended ceiling in upstream of a filtering unit (8) and evaporator.
