And the VOC/dust issue is part of why the requirementsare that 20 feet around the face of the booth all the wiring must be Class 1, Division 2. And no ordinary electric equipment or lights can be in that area either. See 1910.107 and NFPA 33. Note that a sprinker head(s) must also be in that booth.
From: Stuart, Ralph <Ralph.Stuart**At_Symbol_Here**KEENE.EDU>
To: DCHAS-L <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Sent: Thu, Nov 10, 2016 8:27 am
Subject: Re: [DCHAS-L] Exhaust fan design question
> >I hope you the booth is not actually in the wood shop. Flammable vapors are incompatible with combustible dusts.
Good point. It is in a separate room from the wood shaping area.
> >Most spray booths run only on demand since they exhaust a lot of cfm. Multiply the area of the face by a minimum velocity of 100 ft per minute. No system can afford to hurl that amount of air out the stack.
I've seen systems that do; some of our teaching labs have a similar amount of air moving through them.
Thanks for the reminder about the dust / VOC issue.
Ralph Stuart, CIH, CCHO
Chemical Hygiene Officer
Keene State College
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