The vacuum cleaner for works with automatic cleaning. The CTLAC HD suction system is in its element with large amounts of dust, e.g. eg when working with diamond descalers and grinders. Automatic main filter cleaning AUTOCLEAN (AC) rinses the high performance main filter regularly, thus ensuring high and constant suction power. The extremely resistant design with large wheels, steel axle and adjustable steering rollers is synonymous with stability and optimal mobility on any surface. The flat filter completely integrated in the suction head guarantees full use of the volume: thus, the gross and net volumes of the tank are practically identical. The extremely compact high performance turbine ensures proper suction power. With a volumetric flow rate of 3900 l / min, the only thing left is pure air. Authorized for powders and dust classes L.