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---.---- .....-...----.. .._--* : CHAPTER II N077LE PLACEMENT REQUIREMENTS' ."'. ". :'~~.~~"G -:..r.~~. ;'. ,~,;;~.~~. _ ' ~._:t'~~~':?~'h.~~. , . ::The nazz*...u.....,. be iI~ _1he "*...... ~.~ .- ,::-. . :a:__1hey proc.ct. If 1he duct is -.a-1hM 50 inch perime~.. .....:. - s.1he ClOD secdan of __ must be ~ into twO equ.a .~ :=i.~ ~ One nozzle ,..,.1hen be ....t ."111 at'th8~.:- '; w.;dpainc of 1M _m.r protKt. The nozzles naJSt"'" ~ , be instilled so 1hey aim dinIc:dy inID die duct. (See Rgunt 2-1). ~'~'~ As pnwiausIy~. nozzles .. UsI8d and Approved to pro- 1lICt duds of unImited Iength.' A single nazzle wiI proteCt cir; cuI8r duds of 50 inch .,....... (16 inch dlalMw.. Rectangular duds of 50 inch perimeter maY IIso be proteeted with a single nozzle provided no side of 1M ~ exceeds 17 inches in length. . . Two nozzles C8II be used to protect circuI8r duC:ts up to 84 :... '.:- , . inches in ~imew.l26Y. inch in~n.W).1n a situation --- ~:.-:' additional nozzles are used to proteCt ~ducts~' -r.~' 1han 50 inches in pelimeW. the cross sectional.... of the duct . must be divided into equal ~ areas as previously -",:'" _ stated. Each individual ... must sadsfy 1M limitation of 5Of?: inches in pelimeter with a maximum side of 17 inches. (See>,~ ',.Figure 2-2). ' - " . ...'.' Nozzles used with me Pyro c.n Model PCl-185127!1550 w8t ' ;_ c:henUcat extinguishing systems have been 1IISt8d in KCGfd- '.!811C8 with the requirements of Underwrit8r"s l.6....ies Inc.. ': Under_.jtefS Laboratories of Canad8. and Fadary Mutu8I Research. . These systemS have been found to be effedive when applied within the liiI.tations estabfished by that UlSting.It is. tha..fore. imperative that the nozzle placement reqWwmenIs detailed in this section be followed. When the haz8rd is of such a size 1hat it exceeds the limitation of a nozzle. additioMl nazzIes are to be used. In no instance shall any nozzle be used to proteCt .. area greater than its Listed or Approved ~. Nozzles have been developed to protect the foIowing hazards: A. Exhaust Duct G. Synthetic Rock B. Hood and Plenum Charbroiler C. Deep Fat Fryer H. Radiant 0aarbr0iIer D. Griddle I. Natural Oass '.A" E. Range Top CharbroiIer F. Range/Griddle J. Upright Broiler Combination K. Chain Broiler . A. EXHAUST DUCT PROTECTION _ The Model Nl.-P (rIP #722) will sti!I ~ a flow number. :;;;::," , . ..;;. of one and will foDow the br8nch ~ ~ements for the ;r;<.< -:'ModeI NL-D Nozzle mp .721) - This nozzle has been ,.:~ductbranch.AmaximumoftwoflowrunberswillbeaBow-"~~' :~ developed to protect ducts of unlimited length with a ma:ximum ", :JF.=i 'ed per branch. " . :. ~ ._?i,~_:'.."~~..~.~.~ '. 'of 100 inch perimeter. For ducts with a maximum of 100 inch ..:,-<. .' , '. pennimeter. a single exhaust duct nozzle can be used. wt.e~'~;:.: '. " .- . the exhaust duct perimeter is between 100 and 150 inches.~"'" '~ -: .;'~:~"if..' ..=~=.=::--..::= .~~,c; ... .'.';'7.~.' undampered with fan off. or undampered with fan an. It is not. ;.:'.;:..~. : .. :. :. ;,;?~:.:' ::..::==.==:::: ~~....-'1~1 ... they protect. If the duct is larger than 100 inch perimeter. - .. . '.-';;x';;. the cross section of area must be subdivided into two equal , ' , ~~"._. symmetrical areas. One nozzle must then be installed at the ,;~' miclpoint of the area they protect. The nozzles must always --'" be installed so that they aim directly into the duct. (See Figure 2-1.. As previously stated. nozzles are Listed and Appoved to pro- teet ducts of unlimited length. A single nozzle wiI protect cir- cular ducts of 100 perimeter (31 ~ inch di....... Rectangular ducts of 100 inch perimeter may also be p.ollKted with a single nozzle provided no side of the rectangle exceeds 33Y.a inches in length. Two nozzles can be used to protect circular ducts up to 150 inch perimeter (47Y.a inch diameter.. In situaIions where two nozzles are used to protect a rectangular duct of 100 to 150 inch perimeter. the longest side of the rectangle must not ex- ceed 50 inches. (See Figure 2-2). Model NL-P Nozzle mp .722) - The Model NL-P has been developed to protect ducts of unlimited t.ngIb with a ma:ximum of 50 inch perimeter. For ducts with a IIIDimum 50 inch perimeter. a single nozzle can be used. WheN the exbaISt duct perimeter is greater than 50 inches additionII nozzles must be used. These nozzles have been Listed and Appraved for ap- p6cation where the exhaust duct is dampered. undampered with fan off. or undampered with fan on. It is not required that the fan be shut down or the exhaust duct be "tapered for the system to operate properly. UL EX3830 ULC a:X812 MI<< 1, 1988 .;~ . .: ;....;. ::: :; ~:fi~ QJ_2lrW -r o W , .J. G~-==J NI.~ 17- _ L-W . . o W lNl.~ ~o- -J NI.~ 12.5- - e figwe 2-1. Nozzle Cowrage Limitations 8