Abstract: A flat type fan is provided having an axial dimension very much less than its radial dimension, comprising a casing forming a cylindrical duct for a fan blade unit.Two webs carry bosses having fixing bores therethrough. The length of the bosses is equal to the length of the casing, which allows the fan to be fixed on a wall by any one of its faces, for blowing or for suction.

Abstract: The part comprises a hole surrounded by a boss having an end surface perpendicular to its side surface. The nut comprises a threaded screwing cap connected to the base of a coupling mounting having also two legs between which the boss is to be inserted. Near its end surface, the boss is provided with projections, each of which is inserted between one of the legs and the cap.

Abstract: The electric motor with radial air gap comprises a rotor, a stator having a magnetic circuit and windings which form winding heads projecting with respect to the magnetic circuit at the axial ends thereof, a case whose end wall extends radially and a sensor for detecting the position of the rotor fixed on an electrically insulating disc separating that end wall from the winding heads situated on the same side as this wall, applied and immobilized against the case. The sensor has terminals connected to connecting wires which issue from the case at a point remote from the connection point thereof with the terminals, and the internal face of the disc has guide means for leading the wires from one point to the other while passing at a distance from the rotor and the winding heads, which come very close to the end wall.