| 摘要 |
<p>The invention provides a motorised fan unit of the axial type comprising a motor, the output shaft of whose rotor carries a fan blade (18, 24) which is received in a nozzle (12) of a panel to which the motor is fixed, characterised in that the dimensions of the nozzle (12) are matched to the external diameter and to the aerodynamic characteristics of a first fan blade (18), and in that at least one intermediate casing (26) is provided, capable of being mounted in the nozzle (12) in order to allow it to be matched to the characteristics of at least one second fan blade (24) of smaller dimensions. <IMAGE></p> |
