[Jewelry making - Article 00249] - Re: [Orchid] Silicosis and quenching

[Kay Davis]

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    I will just add that while a HEPA filtration vacuum system is much,
    much better than a normal or "Rainbow" vacuum, best of all is a
    vacuum and or ventilation system that first filters trough normal
    filters, then a HEPA filter and then exhausts the air outdoors. 

    While in theory (and when everything is working right) a HEPA
    filtration system will remove those particles, if there is a filter
    or seal failure, you could end up breathing what you don't want to
    breathe... 

    Clean rooms and decontaminating systems use differential gauges,
    alarm systems and trained personal to monitor the effectiveness of
    the filters, most home / small businesses would not have the
    instrumentation or training to be 100% sure that the system is 100%
    good. Therefore exhausting to outside is the one way to be sure that
    if there is any leakage or filter failure that the contaminant is
    diluted (by being mixed in the air outside) to (relatively) harmless
    levels. 

    I will also add that when listening to salescritters claims that a
    vacuum or filtration system is "as good or better than HEPA" ask them
    for written documentation to that effect and mention that you will be
    passing it on to the OSHA (or up here in my part of Canada WCC)
    inspector when they come by to show compliance (and then compare the
    color of their complexion to some white gold alloy to see which is
    whiter )..... 

Kay
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