An electric ventilator comprising an electrical machine and an axial flow fan driven by the electrical machine, the electrical machine having an axis of rotation and comprising: - a casing comprising a base wall transversal to said axis of rotation; - a cap which closes the casing; - a stator, fixed to said casing, comprising a plurality of pole shoes and at least one wire wound on said pole shoes to form a plurality of coils forming a stator winding, said base wall comprising at least one projection projecting towards the inside of the casing according to a line parallel with said axis of rotation, at least one coil of said winding engaging with said projection for heat exchange with said casing by means of the projection, the axial flow fan having said axis of rotation and comprising a central hub comprising a base wall and a lateral wall projecting from said base wall to form a cup-shaped structure, said fan comprising a plurality of blades each fixed to the central hub and comprising a leading edge and a trailing edge, fluid conveying means (207, 211) which are associated with the base wall for conveying air from the inside of the cup-shaped structure to the outside of the cup-shaped structure through the base wall, the electric ventilator being characterised in that the base wall of the electrical machine comprises, on a face of it facing towards the outside of the casing, a first annular channel for discharging heat, said conveying means (207, 211) of the axial flow fan acting at said first annular channel. - a casing comprising a base wall transversal to said axis of rotation; - a cap which closes the casing; - a stator, fixed to said casing, comprising a plurality of pole shoes and at least one wire wound on said pole shoes to form a plurality of coils forming a stator winding, said base wall comprising at least one projection projecting towards the inside of the casing according to a line parallel with said axis of rotation, at least one coil of said winding engaging with said projection for heat exchange with said casing by means of the projection, the axial flow fan having said axis of rotation and comprising a central hub comprising a base wall and a lateral wall projecting from said base wall to form a cup-shaped structure, said fan comprising a plurality of blades each fixed to the central hub and comprising a leading edge and a trailing edge, fluid conveying means (207, 211) which are associated with the base wall for conveying air from the inside of the cup-shaped structure to the outside of the cup-shaped structure through the base wall, the electric ventilator being characterised in that the base wall of the electrical machine comprises, on a face of it facing towards the outside of the casing, a first annular channel for discharging heat, said conveying means (207, 211) of the axial flow fan acting at said first annular channel. said base wall comprising at least one projection projecting towards the inside of the casing according to a line parallel with said axis of rotation, at least one coil of said winding engaging with said projection for heat exchange with said casing by means of the projection, the axial flow fan having said axis of rotation and comprising a central hub comprising a base wall and a lateral wall projecting from said base wall to form a cup-shaped structure, said fan comprising a plurality of blades each fixed to the central hub and comprising a leading edge and a trailing edge, fluid conveying means (207, 211) which are associated with the base wall for conveying air from the inside of the cup-shaped structure to the outside of the cup-shaped structure through the base wall, the electric ventilator being characterised in that the base wall of the electrical machine comprises, on a face of it facing towards the outside of the casing, a first annular channel for discharging heat, said conveying means (207, 211) of the axial flow fan acting at said first annular channel.