Electric vacuum unit with Roots vacuum pump, suitable for fixed installation in large central suction systems. Can be used for general cleaning, suction from grinding machines, for powder transportation etc. Filter cartrigde category M fitted as standard main filter and controll filter, HEPA/Absolute filters category H can be supplied. Efficient main filter cleaning by automatic PLS controlled pressurized air. PLS, Y/D-start, thermal overload control, vacuum control and false air valve fitted as standard. For suction and recovery of large quantities of material it is recommended to install a silo preseparating system with cyclonic material discharge.