Abstract: The fan has an arrangement for monitoring the ageing of at least one of its bearing, the arrangement including a reference ambient temperature sensor and a processing circuit for comparing the temperature difference between the temperature measured by the temperature sensor or by each temperature sensor fitted directly on the corresponding bearing and the temperature measured by the reference temperature sensor with a first predetermined value.

Abstract: The fan has a support structure (11), an impeller (16) supported by a shaft (26) coupled to a drive motor (24), and at least one ball bearing (30, 32) interposed between the shaft (26) and the support structure (11), the fan having means (40) of monitoring the ageing of the bearings, the means (40) of monitoring the ageing including: a temperature sensor (42, 43) fitted on at least one bearing (30, 32); a processing circuit (44) connected to the temperature sensor (42, 43) and capable of providing an indicator representing the measured temperature and of evaluating the indicator, or each indicator, with respect to at least one predetermined criterion. The temperature sensor is fitted directly on a bearing race in contact with the support structure.