The ventilator switches on automatically as soon as the toilet lid is opened and extracts unpleasant odours directly at the toilet bowl via the aerodynamically adapted extraction shaft. A powerful filter removes these odours, resulting in a pleasant room climate and a noticeable increase in comfort in a confined space. The ventilation system integrates all electrical and other components and is effortlessly glued to the toilet without the need to drill holes in the seat, tank or vehicle.