and a battery for driving the electric motor wherein the intake fan has a guide blade and an impeller and the intake fan is arranged in a chimney shaped shell on the filter housing application_number US 201214009982 A description in fig1 a cleaning device 1 is shown in exploded view and in fig2 to 7 different details are shown in perspective view in cross section and in a detail view the cleaning device 1 has a cylindrical filter housing 2 with a base surface of a right angled triangle with two identical sides in each of the surfaces 3 and 4 of the filter housing which form a right angle with one another a respective circular cylindrical flange 5 is molded which has an inner border 6 a circular plate 7 with a smaller diameter than the flange 5 is provided so that a small circular distance is created between the border of the plate 7 and the flange 5 further provided is a flange 8 with an internal thread 9 which can be fastened in the flange 5 with a press fit the distance between the flange 8 and the inner border 6 is determined by two sleeves 10 by means of tension spring 11 the plate 7 which serves as dust flap is pulled against the internal thread 9 the diameter of the plate 7 is again greater than the internal diameter of the internal thread 9 so that the plate 7 seals dust tight against the internal thread 9 further two pins 12 are provided on the plate 7 which are each guided in a semi cylindrical.