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r,ENERALREGULA710N5 <br />� <br />TABLE 308.6 <br />CLEARANCE REDUCTI'vN M17ETHODS <br />�REDUCED CLEARANCE WITH PROTECTION (inches)' <br />iHorizontal com6usti6lc assemhlics <br />Horizonla�^^mhustiDleassemhlics iocatedbencathlhehealsowceandalt <br />; Iocated a5ove Ire heal source verlical combustihie assem6lies <br />TYPE OF PRCTECTIVE ASSEPdBLY" <br />G�h•anized shcet mc�al, minimum nominal lhitkncss of 0.024 <br />inch (No. 34 Gage), mounted on I-inch elass fiber or mineral <br />wool bau rein(orced with ��ire on ihc back, 1� inch o(f the <br />Required clearance lo com6usti6les I Req��ired clea�ance to com6ustibles <br />wllhout pf0lettion (inthc5j° without pfotettion (inches)° <br />36 18 � 9 6 � 36 � 18 9 � 6 <br />18 I 9 I 5 I 3 I 1� I G I 3 I 3 <br />Galvanized sheet melal, minimum nominal ihickness o( 0.024 � � <br />inch (No. 24 Gage), spaced I inch off �he combustible l8 I 9 5 3 12 6 3 ? <br />T�vo laycrs of galvanizcd shce� mc�al, minimum nominal � <br />�hitAness of 0924 inch (Ko. 24 Gogc), having a I-inch IS 9 5 3 I? G 3 3 <br />airspace benveen layeis, spaceJ I inch of( ihe coinbustiblc <br />'I'«�o laycrs o( galvanized shce� mcial, nunimum nominal <br />ihkl:ncss o(0.024 iuch (No. 24 Gagc), hariug I inch of <br />❑6erelass inSulaUon between layers, spaccd 1 inch oB the <br />combustiblc �ssem6ly, <br />OS-inch in �rganic hsulaiing board, ovcr I inch o( fibcrglass or <br />mineral u�ool ba�l ag�inst �he combus�ible :�ssembly <br />3.5-inch brick aall. spxcd I mch o(( thc combus�iblc wall <br />35-inch brick wall agamst the combustiblc wall <br />IS � 9 � 5 � � � 12 � G � 3 � 3 <br />24 I 12 I 6 I 4 I 19 I 9 I 5 I � <br />, I _ I — I — I — 24 I I G_—�i <br />Por SI: I inch = 25A mm. °C = IPF)�3'_Il 1.3. I pounJ per cul�ii f oai = 16D2 kgnn'. I 0 �w . m/fi' . h.^P = UJ a4 �\'hn' . K. <br />a. �lincralwuulanAglnsG6er6.ius(bl:wAcicrbo:ud).6,Jlhacc.i�ninuuumdcn.iipulRpoumispucubicfuoian;Lnnmmmm�nchinppomlu(I.i00`f.lusul��wn <br />m:ncrial ulilizcd as par� of :� ncmina� mduclion sy�d���u �La111ia�c a �hcnnal tnndu.'iivn}' ol I.Q Rm . m/j(r . h.°Fl or Icss InSuialion bo.uJ shall bc (onncd ol <br />uontowb��s�iblc m:ncn:J <br />\Vhere required cleannces are not listed �n'I:ible 303.6, thc <br />reduccd cicannces shall bc dc�crmincd by lincar imcrpolation <br />belwecn �he dis�:mces lis�ed in Uie lable Reduced cicar.�nces <br />shall not be dcrivcd by extrapolation bdo��� Ihe range o( the <br />table. <br />308.7Sulid 1'ue6burningapplianees.Theclearancereduction <br />mcihuds spccificd in'1'ahle J08.G shall no� be utiliud ro rcduce <br />ihe clearance iequired (or solid fuel-burning appliances iha� <br />arc labcled lor installation w�th dearances of 12 inches OOS <br />mm) or less. \Vhcre appiiances are labd^d for insiallation �� ith <br />denrances uf greater �han 12 inches (305 mm), the cle�uance <br />reduction mcthods of Tablc 308.6 shall not rcduce thc dear- <br />ance to less th�n 12 inches (305 mm). <br />3U8.8 Plnsonr} chimneys. The cicarancz reduction methods <br />specificd in 7able 30R.6 shall not be ulilizcd to reducc Uie cfear- <br />ances required (or masonry chimneys as specified in Chapter S <br />and thc /nrerna�iaial liuilding Codc. <br />3U8.9 Chimney conneclor pass•ihroughs. The clearance <br />redunion mcthods specificd in Table 308.G shadl aot be wilized <br />26 <br />to reduce d�e clearanees required for chimney conneclor <br />pass-diroughs as spccified in Scction 803.10.4. <br />3U`�.10 11�lasunrp lireplaces.'fhe clearance reduction methods <br />spccificd in'fable 303.G shall no� be utilized io rcduce d�e clear- <br />.:nccs rcquircd for masonry lircpiaccs as spcclficd in Chapter S <br />and tice Lucnm�iaria! Uui[Aing Codc. <br />311R.11 Kitchen exhausl ducls. The clear.mce reduction meth- <br />ods specified in'I;ible 308.G shall not be utilized to mduce lhc <br />minimum clearanccs rcquircd by Section 5063.10 (or kitchen <br />exhaust ducts enclosed in ;i shaft. <br />[B] SECTION 309 <br />TEMPERATURE CONTROL <br />[R] 309.1 Space-heating systems. Interior spaces intended for <br />human occupancy shall be provided �vith active or passive <br />spacc-hca�ing syslems capablc of maintaining a minimum <br />indoor tcmperaturc of G8°F (20°Cl at a pnint 3 feet (914 mm) <br />above (looron ihedesign heating day. The insLillation of porta- <br />20061NTERNATIONAL MECHANICAI CODE'� <br />