[Jewelry making - Article 00095] - Re: [Orchid] Safety of fans for soldering ventilation

[John Donivan]

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    The essential, rhetorical question to answer your question (try
    writing THAT again!) is: Why would you be exhausting flammable gases?
    Are you going to have leaky tanks? Are you going to leave your
    torches open all the time? This is what got the Grainger guy. You see,
    you are not exhasting flammable gases per se, you are exhausting
    fumes. When you say what you said, you meant (unknowingly) that you
    were going to exhaust a room full of gas, as in an industrial gas
    plant, and you need a TEFC motor for that. What you are really doing,
    though, is ventilating a room, which you can do with about any fan
    you like. Since there is gas present (like in your kitchen), it would
    be smart to have some "natural" ventilation, too, like for at night or
    when you are away, so gas can't build up in the room. What they call
    "vents" - there are many kinds - can do that, so you always have a
    crossdraft even when the room is closed up. The point to understand,
    and about the Grainger guy: The level of gas at which point you can
    light a match in the center of the room, and it will explode, is so
    high that you will likely be suffocated before that time. It takes
    like a 50/50 mix of gas and air for that to happen. I'm not saying to
    take it casually, but don't be all paranoid about a little seepage,
    either - careful and safe, yes - paranoid, no. 

http://www.donivanandmaggiora.com
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