[Jewelry making - Article 00376] - Re: [Orchid] Venting a torch for a classroom

[Kennon Young]

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Noel,

    A vacumm cannot be achieved in a room that has unlimited access to
    new air. 

    If you cannot determine how much air intake you have, you will not
    be able to determine the amount of actual air you can take in. If you
    displace a certain volume of air you will want to replace it with
    clean air (like breathing?). 

    Without this air replacement (at slightly less pull then the
    exhaust), you'll burn your fan out due to stress. Kind of like
    running your car in sixth gear while going 20MPH. 

    At a low ball figure, a fan replacement, if you can do it yourself,
    will cost $200 (20' X 20' X 15' studio). Things that make you go
    Hmmmmmm, wheres all my money? 

    You will also want directionality to your air flow. You dont want
    chemicals blowing into your face before they exit the room. Free
    holes will bring air in from where ever the _____. Again, not a good
    idea. 

Kennon
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