[Jewelry making - Article 00060] - Re: [Orchid] Safety of fans for soldering ventilation

[Norman Buck]

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    I was taught to use turn off the bottle valve and light the torch to
    bleed the lines. Then you are not directly venting the flammable
    gasses. 

    You should be able to use a standard exhaust fan. Even venting
    un-burnt propane with a proper vent fan running it should be hard to
    get the propane above 2% concentration required for ignition. 

    See: http://tinyurl.com/ll9vr 

Norman
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