Abstract: The ventilation device according to the invention includes a fan and an inverter. The fan comprises a rotary electrical machine and a wheel for setting an air flow into motion, integral with the rotary machine to set it in rotation. The inverter is connected to the rotary machine and, in one motor power mode of the ventilation device, is suitable for forming the supply current of the rotary machine. The inverter is suitable for being connected to a power supply network. The inverter is reversible and is, in a generating mode of the ventilation device, suitable for converting the electrical energy supplied by the rotary machine when it is driven mechanically by the wheel and injecting said converted electrical energy into the power supply network.

Abstract: The ventilation device according to the invention includes a fan and an inverter. The fan comprises a rotary electrical machine and a wheel for setting an air flow into motion, integral with the rotary machine to set it in rotation. The inverter is connected to the rotary machine and, in one motor power mode of the ventilation device, is suitable for forming the supply current of the rotary machine. The inverter is suitable for being connected to a power supply network. The inverter is reversible and is, in a generating mode of the ventilation device, suitable for converting the electrical energy supplied by the rotary machine when it is driven mechanically by the wheel and injecting said converted electrical energy into the power supply network.

Abstract: The fan comprises a support structure, a wheel which is carried by a shaft which is coupled to a drive motor and at least one ball-bearing which is interposed between the shaft and the support structure, the support structure comprising an outer conduit which encloses a bulb-like portion which has a chassis for supporting the drive motor and the wheel, the outer conduit and the bulb-like portion delimiting an annular channel for circulation of air which is caused to move by the wheel, the fan comprising means for monitoring the ageing of the bearings.