It is a centralized unit equipped with brushless motors (without carbons). The filtering system is made of a couple of high efficiency and self-cleaning cartridge filters and of a dust separator positioned on the air entrance. The machine is automatically controlled by a computer monitoring the power supplied to the motors, according to the working users and the filters cleaning cycles. The filters maintenance is indicated by the computer display after about 1500 working hours; a sound signal warns when the lower container has to be cleared out (it can contain up to 60 Kg of plaster dust). The unit has to be connected to a compressor having a minimum capacity of 150 litres per minute. Technical features: Supply: 230V 50-60 Hz monophase; Power: 3600 W; Air compressed pressure: 6 bar; Piping: 110 mm diam., maximum length 24 m (the diameter decreases step by step till 40 mm in the workstations); Users: till 10 at the same time; Noise: 74 dBA with silencer; Size: cm 115x47x183, (plus 30 cm on the right side for the piping system).