The inventive appliance is represented in perspective with a front incline. Said appliance is easy to construct and essentially consists of a blower (1) provided with a blast pipe (2) and a receiving container (3) for a hollow cylindrical reel (4) of flex, said container being arranged around the blast pipe (2). Said reel (4) of flex is visible as the receiving container (3) consists of a polycarbonate tubular section which enables the inside thereof to be seen. The reel (4) of flex consists of cable insertion flex and has a free region (5) along its cylindrical axis, from which the flex (6) can be gradually radially unwound from the inside towards the outside. The receiving container (3) is closed by a flange (8) on the front side thereof, said flange carrying an opening sleeve (10). When in operation, the blower axially transports air through the appliance, such that the flex (6) is carried along, and thus unwound from the reel (4), and transported outwards through the opening sleeve (10) and then through a connected cable sheath of any length, even having a plurality of bends.