An air outlet device has a supporting structure suitable for communicating, in use, with an air ventilation system, and an outlet member that is configured so as to supply an air flow along an outlet axis and is coupled to the supporting structure so as to rotate by 180° about a joint axis orthogonal to the outlet axis, to assume two opposite configurations. The outlet member comprises a plurality of deflecting walls defining a plurality of air ducts, which are arranged about the outlet axis and distributed axially in sequence. The deflecting walls are shaped and/or positioned so as to guide the air in the air ducts in directions having a radial component. At least one of the deflecting walls has a series of through-holes made in positions that are spaced apart about the outlet axis.