Seat support element comprising a ventilation device for a bearing surface

A seat support element comprising a frame and a padding mounted on the frame, said padding extending between an internal surface, close to the frame on an external side of said frame, and an external surface, opposite the internal surface and defining a bearing surface for an occupant of the seat, the support element comprising a ventilation device for the bearing surface, said ventilation device comprising a fan, mounted on the frame and arranged to emit a gas flow to the padding, and a bellows extending between the fan and the internal surface of the padding in order to transmit said gas flow from the fan to the padding, wherein the bellows comprises at least one fastening tab integral with the bellows forming a single piece and passing into an orifice passing through the frame from the external side to an internal side of the frame, opposite the external side, said fastening tab being attached to the frame on the internal side of said frame.