Conveying and processing equipment needs to be regularly cleaned. In cement plants, in order to be as effectively as possible, suction work is usually done with DN 60 flexible hoses. For this industrial vacuum cleaners from 5.5 kW upwards or stationary vacuum units with pipeline systems are being used. For large material accumulations, suction hose diameters of DN 80, 100 or 125 are available. With large stationary or mobile suction units, it is possible to achieve conveying rates of up to 60 t/h.