This series of vacuum cleaner is pneumatic operated, suitable for gas hazardous area Zone 1 and Zone2, dust hazardous area Zone 21 and Zone 22, used to clean up and recycle of aluminum powder; magnesium powder, titanium powder and other explosive dust Widely used in vehicle and aerospace industry. It is necessary to use explosion proof vacuum cleaner because most of the dust generated by the polishing of these materials is flammable, explosive and spontaneous combustion.