An electric ventilator comprising an electrical machine and an axial flow fan driven by the electrical machine , the electrical machine having an axis (R) of rotation and comprising: - a casing comprising a base wall transversal to said axis (R) 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 (R) 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 (R) 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 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 of the axial flow fan acting at said first annular channel . - a casing comprising a base wall transversal to said axis (R) 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 (R) 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 (R) 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 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 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 (R) 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 (R) 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 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 of the axial flow fan acting at said first annular channel . <EOS>