[Jewelry making - Article 00202] - Re: [Orchid] Shop Setup and Ventilation

[dan . wellman]

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    Some options on the squireel cage fan: 

    1. If it is a balt drive fan You can adjust the speed by making
    changes to the drive package (the pulleys and belts) 

    2. If it is direct drive. you can set it for the lowest speed
    usually using the red and common to power it 

    3. You may be able to find a speed control device to manually control
    how much exhaust. Most motors for a furnace of that size will be in
    the 1/4 - 1/2 hp size range. A good motor rebuild shop should be able
    to help you in selecting a speed controller if possible for that
    motor. If you enclose the motor in a cabinent and use several inlet
    ducts you can control where the fune pick up is. I have seen
    commericial solering stations with an overhead drop using a round
    flexible duct with a screen over the end and a manual damper. You
    could use the kitchen hood. 

    4. This blower is probably overpowered for your needs but can be
    worked withif you can drop the speed down enough. 

    5. And very importantly, remember that the air you are exhausting has
    to be replaced from somewhere. Worst case would be to have it suck
    down the flue / chimeny and bring in fumes / Carbon Monxide from the
    furnace or water heater. Not quite so deadly but still important is
    that if you exhaust without making up for it; you create a "negative
    pressure" where the area will tend to concentrate germs, fumes etc.
    This is what is know as a "sick building" commercially, due to the
    continual colds and flus that seem to happen in commericial office
    buildings. An open window or door etc. can be enough for a small area
    and your purposes. 

    Common sense and thinking about this will help you to have a good
    system and be safe. Take the blower into a good motor shop where they
    rebuild motors and get an opinion on speed controling that fan, it is
    probably your best option to use it. 

    Contact me off list if you have more questions, I realize I have
    presented a lot of options. 

Dan Wellman
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