Engine fans for a fan installation of a vehicle comprising: - a mount in which is housed an electric motor which has a shaft extending along a longitudinal axis, the shaft comprising a zone capable of receiving a turbine, said motor having a mass equilibrium line transverse to the longitudinal axis and passing through a centre of gravity of the electric motor, said mount being connected to the motor by a plurality of decoupling means distributed around the periphery of the motor, the longitudinal position with respect to the mount of at least one decoupling means and a dimension of said decoupling means along the longitudinal axis are determined with respect to the mass equilibrium line relative to the mount, characterized in that - said mount comprising an edge which extends in a plane on the side of said zone relative to the mass equilibrium line, in which the mass equilibrium line and the plane are spaced apart by a value of between 11 and 25 millimetres - in which a distance along the longitudinal axis which separates the mass equilibrium line and a median plane from the decoupling means is between 0 and 7 millimetres, and in which: - the median plane is between 0 and 5 millimetres from the mass equilibrium line when the latter is between 11 and 18 millimetres from the plane, the weight of the electric motor being less than 1000 g, - the distance between the median plane and the mass equilibrium line is between 2 and 6 millimetres when the mass equilibrium line is at a distance of between 14 and 22 millimetres from the plane, the weight of the electric motor being between 1000 g and 1100 g, - the distance between the median plane and the mass equilibrium line is between 3 and 7 millimetres when the mass equilibrium line is at a distance of between 17 and 25 millimetres from the plane, the weight of the electric motor being greater than 1100 g, - the median plane extending on the side opposing the zone relative to the mass equilibrium line, - a turbine mounted on the shaft of the electric motor; - in which the dimension along the longitudinal axis forms a length of the decoupling means of between 15 and 40 millimetres, - the length of the decoupling means being between 15 millimetres and 25 millimetres when the mass equilibrium line of the electric motor is located 17 millimetres or less from the plane, - the length of the decoupling means being between 18 millimetres and 32 millimetres when the mass equilibrium line of the electric motor is located between 17 and 22 millimetres from the plane, - the length of the decoupling means being between 23 millimetres and 40 millimetres when the mass equilibrium line of the electric motor is located more than 22 millimetres from the plane. - a mount in which is housed an electric motor which has a shaft extending along a longitudinal axis, the shaft comprising a zone capable of receiving a turbine, said motor having a mass equilibrium line transverse to the longitudinal axis and passing through a centre of gravity of the electric motor, said mount being connected to the motor by a plurality of decoupling means distributed around the periphery of the motor, the longitudinal position with respect to the mount of at least one decoupling means and a dimension of said decoupling means along the longitudinal axis are determined with respect to the mass equilibrium line relative to the mount, characterized in that - said mount comprising an edge which extends in a plane on the side of said zone relative to the mass equilibrium line, in which the mass equilibrium line and the plane are spaced apart by a value of between 11 and 25 millimetres - in which a distance along the longitudinal axis which separates the mass equilibrium line and a median plane from the decoupling means is between 0 and 7 millimetres, and in which: - the median plane is between 0 and 5 millimetres from the mass equilibrium line when the latter is between 11 and 18 millimetres from the plane, the weight of the electric motor being less than 1000 g, - the distance between the median plane and the mass equilibrium line is between 2 and 6 millimetres when the mass equilibrium line is at a distance of between 14 and 22 millimetres from the plane, the weight of the electric motor being between 1000 g and 1100 g, - the distance between the median plane and the mass equilibrium line is between 3 and 7 millimetres when the mass equilibrium line is at a distance of between 17 and 25 millimetres from the plane, the weight of the electric motor being greater than 1100 g, - the median plane extending on the side opposing the zone relative to the mass equilibrium line, - a turbine mounted on the shaft of the electric motor; - in which the dimension along the longitudinal axis forms a length of the decoupling means of between 15 and 40 millimetres, - the length of the decoupling means being between 15 millimetres and 25 millimetres when the mass equilibrium line of the electric motor is located 17 millimetres or less from the plane, - the length of the decoupling means being between 18 millimetres and 32 millimetres when the mass equilibrium line of the electric motor is located between 17 and 22 millimetres from the plane, - the length of the decoupling means being between 23 millimetres and 40 millimetres when the mass equilibrium line of the electric motor is located more than 22 millimetres from the plane.