[Jewelry making - Article 00864] - Re: [Orchid] Ventilation / Fume Extraction

[Jesse Brennan]

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    I did not post on this subject as  a negative on what anyone  was
    doing. I did want to get actual standards posted on how to handle a
    venting problem as required in academic and industrial environments.
    OSHA inspectors are still not doing a terribly good job  at
    industrial sites. They target specific exposures and often ignore 
    bigger problems. 

    A canopy hood needs side panels to the bench top to begin to cleanup
    a work surface. A backpanel baffle should be  provided so  exhaust
    occurs partialy from  the benchtop as well as from the top of a
    hood. The MIT site shows a hood cross section. Adding a fresh air
    intake to the bench top  is a good idea and will save some air
    conditioning in the shop space. Whenever you  melt a metal, glass 
    or a flux  you boil up some into a vapor that will condense
    immediately into small invisible particles. Most of these are in the
    size range that are impossible to see and very to remove with
    filtration. These are the worst size for the lungs. In open well
    ventilated  spaces for occasional use with small exposures You don't
    have much risk outside what you get just by living. 

    In a  production full time working shop environment ( with employees
    ) you have a potentially different problem. 

    Jesse  

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