[Jewelry making - Article 00563] - Re: [Orchid] Venting a torch for a classroom

[Kennon Young]

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Noel,

>     Still not evident to me why you would want or need a vacuum. You
>     take air out, it will be pulled in wherever there is an opening." 

    Directionality is a consideration, but only after a vacumm. 

    Not having a vacumm will not give true air exchange. Similar to
    blending eggs, but not rotating the blender- you will have one or two
    really blended eggs, but the rest of the bowl will be runny. Your
    fumes may be removed from the immediate area, but no larger then
    directly under the exhaust. Yes- the intake, if at the other side of
    the room, will transfer air toward your exhaust, but this could be
    considered a mock exchange. True air exchange happens in areas that
    dont have any physical air push/pull because they are in a vacumm. 

    Imagine trying to remove the air bubbles from a flask of investment
    by simply "sucking" them out with a hose. The flask must be in a
    vacumm because it creates "Uniform Pull" (and there is a large
    difference in density; air to investment). There is no greater pull
    in any given spot, therefore allowing all areas to be air bubble free
    (hopefully). 

    When your room has a slight vacumm there is no favoritism from where
    the air is drawn; it is more universal (and in a PERFECTLY sealed
    room it approaches closer to perfect universal pull). This way, the
    student in the back will recieve clean air equally (actually just
    similar-) to the students sitting close to the exhaust. If you ever
    visit a studio that has the vacumm sealed room, you can physically
    feel the vacumm (kinda like the feeling of airplane compression) and
    how the air exchanges. You can also smoke the room and see how the
    air flows. It really is a big difference. Your local
    lumber/furniture factory will most likely have one of these rooms due
    to thier large work areas and toxic finishing fumes. Thier finishing
    areas would never be workable is they didnt create a vacummir
    exchange. 

    IM not sure how well I explained this, but feel free to hit me up
    with clarification. Furthermore, your local OSHA compliant exhaust
    expert should be able to give some great advice and clarification. 

    Nope. Im not an engineer, except when Im trying to resurrect
    grandma's old ring! 

Regards,
Kennon
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