[Jewelry making - Article 01168] - Re: [Orchid] Workshop ventilation questions

[James Binnion]

========[ Invite a Friend - http://www.ganoksin.com/invite.htm  ]========


    Doug, You want somewhere between 10 to 12 volume changes per hour. So
    figure your rooms volume in cubic feet ( width x length x height)
    then divide by the CFM rating of your fan this will give you the
    number of minutes per air change and then divide 60 by that number
    to get the number of changes per hour. 

    Example 10' x 10' room with an 8' ceiling with a fan that exhausts
    200 CFM : 800 cubic feet (10x10x8) / 200 = 4 minutes per change 60
    (minutes in an hour) / 4 (minutes per change)  = 15 (changes per
    hour). 

    The trick is that the nameplate CFM listed on a fan is under ideal
    conditions. Ducting length, size and number of turns all degrade the
    ability of a fan to move air so the true CFM is much lower. Also a
    big item that many people forget, you must have a fresh air supply
    that is going to make up the air that you are pumping out with your
    exhaust fan. You will need an inlet vent as well as the exhaust vent
    and it should not be located near the exhaust vent or you will just
    recycle all the stale air and fumes. -- Jim Binnion 

James Binnion Metal Arts
Phone (360) 756-6550
Toll Free (877) 408 7287
Fax (360) 756-2160
http://www.mokume-gane.com
jbin AT mokume-gane.com
Member of the Better Business Bureau


____________________________________________________________________
T h e   O r c h i d   L i s t
Open Electronic Forum for Jewelry Manufacturing Methods and Procedures
____________________________________________________________________
Orchid FAQ:
~ http://www.ganoksin.com/orchid/faq.htm
Orchid Archives:
~ http://www.ganoksin.com/orchid/archive
Orchid Galleries:
~ http://www.ganoksin.com/orchid/gallery.htm
Invite a Friend:
~ http://www.ganoksin.com/invite.htm
____________________________________________________________________
Tips From The Jeweler's Bench - Article Archive
~ http://www.ganoksin.com/borisat/tip_sear.htm
The Jeweler's Selected Bibliography List
~ http://www.ganoksin.com/jewelry-books
Buy Orchid Jewelry:
~ http://www.ganoksin.com/shop
____________________________________________________________________
-Unsubscribe:
-Email: orchid-request AT ganoksin.com Body=unsubscribe subject=blank
____________________________________________________________________