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Slide 47
    TEXT VERSION OF SLIDE:

    Type: Picture Slide
    Content: Includes photo of workers performing operations with local exhaust systems installed.

    Speaker Notes: The most effective control of silica in the air is by the use of local enclosed exhaust ventilation. When a process of operation is enclosed, and the system is properly designed, a slight vacuum, creating a negative pressure, ensures that any leakage will result in the flow of outside air into the enclosure. A well-designed local exhaust system that encloses the process on all sides is best.