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<br /> (:I.f.Af1AIJCE REDUCTION MGTHODS . _ _ _.
<br /> � _ f1f.DUCFO f,LEARANCE WITH PflOTECTION Qnches)'- _ _
<br /> Norirnnlnl combue1101e as6amblies
<br /> Ilodiamal cambu�tlole nfenmblim IocetnA bnnenln Ihe henl eaurca entl
<br /> I lacqted n0ove tlm henl�ourco nll vahleM combu Ilt In nseambllaa �
<br /> � IloyulmJclenrancolocnmbu�tihlon OeqiOrodclnernnr.nlncambunllble
<br /> wilhoul protectlon Qnchree)'__ _ wllhoul prolecllon(Inchee�'_
<br /> TYPHOPPRO�ECIIVEASSEMULY' _ __ __9G_ 10_ _ 9 f _ 6 Jfi_ _ 1B_ 9 6 ;
<br /> IcJc.uwcJ dicc�um�al,minmmm nnminal Uiickucscu10.024 I .
<br /> mrh(Nn. 2A<i:y.c).muuNed i�n I iuch gl.:.. GM1cr u:miucral �K q 5 7 i2 h 1 7 '6
<br /> innd Lau:cinl�nrrd��'ilh o'iic un lhc back. I inJ�o(f Ihc
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<br /> ( cmnhu5lihltn�scmhly -- —- _'_'_" -._--_ ^
<br /> Il�ui..:ni�cJnhcclmctal�miuiinumnominal!hicAncssuf0.02d -- - _
<br /> I inch(Nu.2d lingcl.spuee.d I ineh uf(Ihe ium6u�iiLlc IN 9 5 ] I: b 3
<br /> � :n.rml0y___ .. ____. ___..-. -____ _.-_ -
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<br /> i f�ru hiycra nl'palr,mir��J�hrcl wclal.miumunn nunuaal I
<br /> . d�icAnc.su1002•linch(No.:J(iugcLL�acimtnl-indi �p q � } 1: G 7 !
<br /> '� :�iupncc hcneccn In)�cis.xpurd I �'+rh nlf Ihc enmbu�lildr
<br /> ' :n�cm61Y__ . . _' _.____ __-_ _______-_'-_"' __..-.
<br /> .I���u la}�c�.n�Rnlcaniird shert mctnl,mininunn nnmin:d . � _
<br /> ' Ciickncnu111,0.'.AinrLINu.2qfingcl,hnciuglim'hul �g y 5 l 12 G 3 )
<br /> I II�CI�III`h III\IIIiII II ql IN'I1V Cfll I.1\'19\.A�IAlC1I I iuth o(I ihr
<br /> �u:ulru��ihic u�tiambl)'____ _ .. _ .__ __ —"_ ' __. . _. '_ _
<br /> lu �:-inchinar��:micin:ulalin�;bnarJ.nvrrlincn�,rr�i,�,��tnwor 2A 12 h A I% 9 5 � II
<br /> ' mmud woul hall �y unsl Ihc i mil i¢tihlc asccmMy _ __ __. __- —— - - .,
<br /> i S.mih 1 ii-1.�v;ill y u. I I_ineh�11 ih� ininlniclihli.wnll - . . 12 _ _G (� (' _�;.
<br /> - _.__' 4 _.
<br /> � � uuh I iic4.�vall..i�,nn.l lhe� mthu lihlc reall . 1=. _".- �J 12 G 5 i
<br /> I,��til i���,n.-,;s.���,�n.°c=1("lin�n.H.iiw�oni�x,.�i,�.�t���n-i��.nzwk.���'.ini�nr����ir•i� 1 -UNIN7in'•K „
<br /> I�IIIICfOI\I'W�IAIItI�:I:NaGIKII'.111\IIIIIIA[IIIIIIIAIJIpII]IIIIYYI'PIIIIIIIIIIIIIIIJf11111r1��N�M�II1Jt�xYIIIII�LMIINIJ�O11t11111111tlflll'IIIIIFIM1101 I.��'.' 1� 6� . i.;.
<br /> � m�irri:ilulJvrAavpanaL�rlr:ir.�nn'irduni�n�)'arm�liailh:ccnlLamnlcundnrlirilY��llllllln inllll'•L•`Ilnrlrsr.lnwlali�n6�.nl Lalll.. . ,',I��f
<br /> i��.i,�im4r.liLlr mnlr�i:J
<br /> •? Ilm column hoadings ol Tnble 306.61ist requiir.d clnar- latin�board used as a componont of cle�r;mr.r, reduc-
<br /> ;mr,es wilhout proteclion. Thc numbers to thr ri�hl o� tion mclhods.�fhis Iranslatns inlo a ininimmn ieyuur.d I
<br /> r,;�r.h m�thad indicatc� tho p�nni,.^,ible reducod clear- insulalion H�value ol(1 A QP x hr x `F)/Dlu/h pnr inch ol
<br /> ��ncn measured f«nn thn��e:d-praJucinc�appliancos to insulaling matcriol.The methods in Tnble 308.G control
<br /> the l�ce ol the r.omhustibin surface. hr.at Uansmission by iclleclinc�Imal r�diation,roterding (
<br /> The r:i�irni�lr,hehindll�r,mr.ihodsof pro�ection lisled thr.rm�l ronduct.inco, and pro�.�iding cunvectivo cool-
<br /> �n lnblo 30D.fi is ba:ed on�he��bilily ol ihu protection ln ing. Whr.m sher.l motal matorials or molal plat�s aro
<br /> i���iur,o fBfll%Ifl� I1Qd� IIOI1fi1111551U11 hom ihe applinnce ;peci�ied,Ihe el(ecliveness of ihc protection can bn r,n- .
<br /> ,indequipman� lo�hecombusliblemalerialsutlmtihe h:�ncr.Jbytherollar.livosurfacooithemet,�I.Painlingor
<br /> tnmpnrduicrisr.oflhocombus�ihlomntmi:ilwillremain olhenvise covering the sur�nce would rr.duco Ihu
<br /> !n 4uw;ho mn�in:um�IimNnd. metal's ebilily to rollecl radiant hr.nt nnri,dr.pendinp an
<br /> AlthoucJh Ihe materials r�leried to in l�nble�OB.G nrr. the cobr,cuuld incir,�so hoat absorption.Tho airspace -
<br /> „��nmon cunstruciion m�terinls, conlusion over the belween ihe prolr,cind surf�co nnd Ihr. clearance-ro• ti
<br /> teim"inorganicinsulntinpbonrd"froqur.nt�yarises.This duction method allaws convr.r.lion aii cunr.nts to cool .:,
<br /> tarm refer:, to noncnmbustib!o minerul bunrds and ihoprolc�r.tionnssemblybycarryln�awayheaUhalhus iy
<br /> uther noncoinbu,liblc; insulating ha�rds Ih�l nrn not been conducted�hrauc�h�he assembly.Where a clear- ,�
<br /> narle of r.nrbomh�sed compounds. Carbon•based nnce-reductionassemblymuslbespac�dtinchollthe
<br /> �.nmpounds nrr,ihosr, lound in celluloso (wood), plas- wnll,tho top,hottom and sides ol the assombly must ie- �y
<br /> hc:and other mntr.rinls m�inulnctured Irom raw materi- m�in opr.n lo permil unreslridod oirllow (conveclion
<br /> ;ds Ihat once existed as living orqani,ms. �!ote ih�t r.un�enis). II Ihoso openings woro not Ihore, tho alr- �.i.
<br /> crmmi� 6oard malerials mus� have n sper.ilied maxi- coohni�woulcl nol lake place nnd tho protection as�om- .
<br /> mum C (conduclance) value in ndddinn to hr.inp bly woidd not be as oflective in limiting tho tempornture x�
<br /> noncombustihl�. n,r, on ihe prorocled smir�ces. Ideally, tho proter,tion
<br /> �ootno�c n specilics a nnximum�hnrmnl -ondudiw assembly shauld be open on all sides to provido mnxi-
<br /> ityv�lue(G�Iconductivityvalu�isiharr.cipro�.,doftheR mumventil��ion.Figures30�.1(3�and3UB.�(7-4)show
<br /> ��nlur;C- 1/Rol�1.0(Otu/h x In.)NIPx hr x°F)lor insu- �scemblics incorporatin�an airspar.n.
<br /> ,�;i, 2007 INTHf1NATIONAL�dECNANICAL CODE'b COMM[NTAf1V
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