[Jewelry making - Article 01108] - [Orchid] Workshop ventilation questions

[doug]

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    Hi gang, Does anyone know if there's an existingformula for
    determining the proper CFM rates for airflow, when properly
    ventilating a workshop? Now that the contractors have finished
    framing-out my new rooms, I need to build and install something whose
    ducts will fit into the ceiling joists, but don't know what size
    motor(s) to buy. FWIW, the lapidary workroom measures 9x11', the
    metalsmithing room is roughly 11x11', both feature81" ceilings and
    insulated floors, and each will soon have a window with one of those
    4" round clothes dryer vents in it,for connecting toinlet and
    exhaust hoses. I know that Charles Lewton-Brain had posted some great
    articles on ventilation in the Ganoksin library in the past,but none
    of them addresses this issue, directly. Might there be an HVAC Tech
    lurking in our midst, somewhere? (Please say 'yes'!) Many thanks, in
    advance, for whatever help anyone can offer. 

My best, as ever,
Douglas Turet


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