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Slide 46
    TEXT VERSION OF SLIDE:

    Title: Predesigned Exhaust System
    Type: Text Slide with Picture
    Content: Illustrates exhaust system with the following identified: size for balance and transport velocity, branch ducts, collector, as well as an arrow pointing down to the fan.

    Speaker Notes: Existing ventilation systems that rely on dilution of the silica dust to the safe concentration, are often not adequate, as they sometimes recirculate dust into the building. Some sources may need properly designed local exhaust systems to remove the dust at the emission source. Where employees are close to the emission source, local exhaust is usually superior to dilution.