Abrasive blasting containment system

An abrasive blasting containment system particularly adapted for cleaning large turbines and the like and for preventing the escape of abrasive blasting particles, said system comprising

• a portable blasting room enclosure including a substantially square open frame member, flexible opposite side and end walls, and a roof supported on said frame and including a central air entry opening therein,
• air circulating means including a blower, a pair of elongate and spaced parallel air return ducts extending along the lower edges of said opposite side walls of said blast room enclosure and defining opposite side boundaries of a first solid floor area beneath said blasting room enclosure, said spaced parallel air return ducts also extending outwardly beyond said blast room enclosure and defining opposite side boundaries of a second solid floor area extending between said air return ducts and adjacent the first floor area beneath said blasting room enclosure, said air return ducts being positioned above the level of said solid floor, abrasive particle separator means, and pipe means communicatively interconnecting said air return ducts, said abrasive separator means, said blower, and said central opening in said roof of said blast room enclosure to provide a closed loop conveying air stream through said blasting room enclosure,
• inlet air diffuser means extending parallel to and spaced below said roof and covering the air entry opening therein for uniformly distributing the air introduced into said blast room in a downward direction and into said parallel air return ducts without creating turbulence in said blast room,
• track members extending parallel with and along the length of said air return ducts, and
• roller means supporting the lower portion of said portable blasting room enclosure, said roller means being mounted on said track means to permit rolling movement of said portable blasting room enclosure between positions covering said first and second floor areas.