First the booth is not a duct even though the air moves directly through it. Is the room that return and supply ducts terminate at a duct or plenum? i don't think so. Now for the real question. I'd argue that a vertical duct is not what is being discussed except a vertical duct could be considered a stack and a duct that exhausts to the outside at is terminus is definitely definitely a stack (unless their is some special definition changing the general meaning of the word to something specific and different). So even though I'd like to argue that a single head near the top in a typical booth stack would flood the the entire thing, and with a gravity assist for the lower regions no matter how tall, I think I have to agree with Ryan that the code, or at least that passage, is pretty clear. Your job now is to find out if that passage only applies to some special condition that you don't have. Just today a couple of students performing a code search as part of their contribution to a large project went to IFC before the IBC, ignored a clause that stated "where required by XXX", and misinterpreted what throughout meant. The result was that they thought they had to put smoke detectors in racks in a fully sprinklered warehouse. Claggart to Billy Budd: "The sea is calm you said. Peaceful. Calm above, but below a world of gliding monsters preying on their fellows. Murderers, all of them. Only the strongest teeth survive. And who's to tell me it's any different here on board, or yonder on dry land?"
On Tue, Feb 1, 2011 at 2:05 PM, A.P.Silva <[email protected]> wrote: > Is this how everyone else reads it? If the duct was larger, it would be like > a room. Or say a paint booth. If the paint booth which is part of the > exhaust system was 13' high, we will need two levels of sprinklers? I'm not > being sarcastic. Just trying to understand the code. > > Tony > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Ryan Peterson > Sent: February 1, 2011 2:52 PM > To: [email protected] > Subject: RE: Exhaust duct > > > NFPA 33 2011 9.4.6 Sprinklers systems protecting stacks or ducts shall meet > all of the following requirements: > (1) Sprinklers shall be spaced no more than 12' apart. > > Since the standard doesn't differentiate between vertical or horizontal duct > then I interpret it to require sprinklers to spaced 12' on the vertical as > well as horizontal. > > > Ryan Peterson > Wayne Automatic fire Sprinklers > 407-877-5593 > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of A.P.Silva > Sent: Tuesday, February 01, 2011 2:55 PM > To: [email protected] > Subject: Exhaust ducct > > > I normally provide one head at the top of a vertical exhaust stack coming > off a paint booth. The vertical duct is about 25 feet high. The booth > manufacturer says there should be two heads as maximum spacing on vertical > duct is 20 feet. Is this normal? > > Tony > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
