Abstract: A centrifugal regulator device for opening and closing the pivoted-vane shutter associated with an electric fan unit, has a base element connected for rotation with the fan and an actuator member guided for movement towards and away from the base element by apertured appendages slidingly coupled with corresponding guide rods fixed to the base element and extending parallel to and spaced from the axis of rotation of the fan, the actuator member being connected to the base element by means of at least two pivoted arms each including a centrifugal mass and cooperating, in the fully open position of the vanes with mechanical end stop members.