I would design using the duct criteria since the pit is after the filters. I think it's considered the plenum which is part of the exhaust ductwork. Just my opinion. rick
On Fri, Aug 18, 2023 at 4:37 PM Anthony Johnson <[email protected]> wrote: > The pit has a metal grate over it with the filters being installed just > below the grate. It then turns the corner and goes up out the exhaust > stack. I would normally just consider the exhaust stack as the exhaust > 'duct' and not the entire pit but then I got to thinking. On a friday > afternoon that's probably a bad idea. > > > > <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> > Virus-free.www.avg.com > <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> > <#m_-5211560169863844847_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > On Fri, Aug 18, 2023 at 2:20 PM BRUCE VERHEI <[email protected]> wrote: > >> I’d expect the underfloor to have two sections. One the plenum, is >> immediately below the filter bank. >> >> The second is the exhaust duct. >> >> Best. >> >> bv >> >> On 08/18/2023 12:50 PM PDT Rick Matsuda <[email protected]> wrote: >> >> >> >> Yes, install sprinklers in the pit and along any “ductwork” that goes >> from the pit to the exterior. >> >> On Aug 18, 2023, at 2:43 PM, Anthony Johnson <[email protected]> >> wrote: >> >> Hi Folks, >> Quick one for the day - is a paintbooth pit to be considered as a duct? I >> know most people, at least I do, think of a duct as a cylindrical or >> rectangular sheet metal tube for ventilation. A quick google dictionary >> defines it as a tube or 'passageway' for converting air, liquid whatever. >> That leads me to the question of whether a downflow paintbooth pit would be >> considered a duct for design purposes and would require the duct protection >> criteria of NFPA 33 which requires a minimum of 30 gpm at 15 psi for the >> sprinklers? >> >> Best Regards, >> Anthony Johnson >> Mountain Fire Protection >> 'Saving Lives and Valuing Property' >> >> >> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> >> Virus-free.www.avg.com >> <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> >> >> _________________________________________________________ >> SprinklerForum mailing list: >> >> https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org >> To unsubscribe send an email to >> [email protected] >> >> >> _________________________________________________________ >> SprinklerForum mailing list: >> >> https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org >> To unsubscribe send an email to >> [email protected] >> >> >> _________________________________________________________ >> SprinklerForum mailing list: >> >> https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org >> To unsubscribe send an email to >> [email protected] > > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > [email protected]
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