The compressed air vacuum cleaners series “AD” are suitable where electricity is either absent or prohibited, working with compressed air and without moving elements: the vacuum is created by a “Venturi” system. Versions X1-X2-X3 can be used in hazardous areas classified zone 21-20 internally: marked EX II 2/1D. They are equipped with an ejector Venturi, an antistatic star filter Ø 360 and removable