Larger amounts of suction material are extracted with a DN 80 flexible hose. Thin layers, e.g. at the annealing line are usually extracted with DN 50 or DN 60 hoses. The pipeline system is dimensioned accordingly. Several operators can work simultaneously. The suction power is created by a 30 kW KS-300 unit with a rotary piston pump. The suction material is collected centrally with the help of a FiltroJet filter hopper. It is discharged downwards into an existing storage silo.