Plenums are covered in NFPA 90A section 4-3.11 (2012). Sprinklers are not required, but everything in the space must be noncombustible, including any electrical wiring, cables, and sprinkler pipe serving other areas...
For sprinklers: 4.3.11.2.6.3 Nonmetallic fire sprinkler piping shall be listed as having a maximum peak optical density of 0.5 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) or less when tested in accordance with ANSI/UL 1887, Standard for Safety Fire Test of Plastic Sprinkler Pipe for Visible Flame and Smoke Characteristics. Duane Johnson, PE Program Manager Division of the Fire Marshal (Contractor) Office of Research Services National Institutes of Health 301-496-0487 "Protecting Science - One Sprinkler at a Time" -----Original Message----- From: Brian Harris [mailto:[email protected]] Sent: Monday, August 05, 2013 11:00 AM To: [email protected] Subject: RE: Special Situations (8.15) 10-4, I'll suggest the plenum be enclosed with type "x" in order to apply 8:15. For my own future reference is standard drywall considered limited combustible in any case? Brian Harris, CET BVS Systems Inc. bvssytemsinc.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ron Greenman Sent: Monday, August 05, 2013 10:54 AM To: [email protected] Subject: Re: Special Situations (8.15) Type X On Mon, Aug 5, 2013 at 7:41 AM, Brian Harris <[email protected]>wrote: > I guess the big question then is standard 5/8" GWB considered limited > or non-combustible. If memory serves me correct I believe it has a > 1hour fire rating? > > Brian Harris, CET > BVS Systems Inc. > bvssytemsinc.com > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Reed A. > Roisum, C.E.T. > Sent: Monday, August 05, 2013 10:38 AM > To: [email protected] > Subject: RE: Special Situations (8.15) > > Correct. If indeed the plenum created is a noncombustible concealed space. > > Reed A. Roisum, C.E.T. | Karges-Faulconbridge, Inc. | Fire Protection > Designer | Fargo, ND | direct: 701.552.9903 | mobile: 701.388.1352 | > http://www.kfiengineers.com > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Brian > Harris > Sent: Monday, August 05, 2013 9:27 AM > To: [email protected] > Subject: Special Situations (8.15) > > All- > I recently finished a design for a wood structure day care facility, > (1) level of attic heads and (1) level of ceiling heads. The GC has > now decided in an effort to save money on the HVAC to attach drywall > to the bottom of the wood joist and use the area between this drywall > and the suspended ceiling as a return air plenum. If I'm reading > 8.1.1.2.1 & 8.15.1.2.2 correctly I do not need to add a 3rd level of > protection in this "plenum" > area correct? > > Brian Harris, CET > BVS Systems Inc. > Sprinkler Division > bvssystemsinc.com<http://bvssystemsinc.com/> > Phone: 704.896.9989 > Fax: 704.896.1935 > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please visit > http://www.symanteccloud.com__________________________________________ > ____________________________ > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org > -- 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, WFSC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
