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GENERAL REGULATIONS <br /> TABLE 308.6 <br /> CLEARANCE REDUCTfON METHODSb <br /> REDUCED CLEARANCE WITH PROTECTION(inches)a <br /> Horizontal combustible assemblies <br /> Horizontal combustible assemblies located beneath the heat source and all <br /> located above the heat source vertical combustible assemblies <br /> Required clearance to combustibles Required clearance to combustibles <br /> without protection(inches)a without protection(inches) <br /> TYPE OF PROTECTIVE ASSEMBLYa 36 18 9 6 36 18 9 6 <br /> �! Galvanized sheet steel,having a minimum thickness of 0.0236 inch(0.6010 mm)(No. 18 9 5 3 12 6 3 3 <br /> �,r� 24 gage),mounted on 1-inch glass fiber or mineral wool bat[reinforccd with wirc on <br /> � thc back,I inch off the cornbustible assembly <br /> Galvanized sheet s[eel,having a minimum thick�ess of 0.023G inch(0.(O10 mm)(No. 18 9 5 3 12 6 3 2 <br /> 24 gage),spaced 1 inch off the combustible assembly <br /> Two layers of galvanized sheet stccl,having 1 minimum thickness of 0.0236 inch 18 9 5 3 12 6 3 3 <br /> (0.6010 mm)(No.24 gage),having a 1-inch airspace between laycrs,spnced 1 inch <br /> off tl�c comhustible assembly <br /> Two layers of galvanized shcet steel,having a minimum tl�ickness of 0.0236 inch 18 9 5 3 12 6 3 3 <br /> (O.6010 mm)(No.24 ga�e),having 1 inch of fiberglass insulation between layers, <br /> spaced 1 inch off the combustible assembly <br /> 0.5-inch inorganic insulating board,over I inch of fiberglass or mineral wool batt, 24 12 6 4 18 9 5 3 <br /> against the combustible assembly <br /> 3'1z inch brick wall,spaced 1 inch off the combustible wall — — — — 12 6 6 6 <br /> 3��,-inch brick wall,a�ainst fhc comhn,ttible wall -- 24 7? 6 5 <br /> -- --- --- ---- — - �-- ----- —� — ------------------ ---- ---.. . ----... <br /> For SI: 1 inch=25.4 mm,°C=[(°F)-32]l1.8,1 pound per cubic foot=16.02 kg/m3,1.0 Btu•in/ftZ•h•°F=0.144 W/m2•K. <br /> a. Mineral wool and glass fiber batts(blanket or board)shall have a minimum density of 8 pounds per cubic foot and a minimum melting point of 1,500°F. <br /> lnsulation material utilized as part of a clearance reduction system shall have a thermal conductivity of 1.0 Btu•in/(ft2•h•°F)or less.Insulation board shall <br /> be formed of noncombustible material. <br /> b. For limitations on clearance reducrion for solid fuel-burning appliances,masonry chimneys,connector pass-throughs,aiasonry fire places and kitchen ducts, <br /> see Sections 308.7 through 308.11. <br /> �� <br /> [F] SECTION 311 <br /> SMOKE AND HEAT VENTS <br /> [F'] 31L1 Required.Approvecl smoke and heat vents shall be <br /> installed in the roofs of one-story buildings where required by <br /> the Internritional Fire Co�le. Smoke and heat vents shall be <br /> designed and installed in accordance with the International <br /> Fire Code. <br /> SECTION 312 <br /> HEATING AND COOLING LOAD CALCULATIONS <br /> 3121 Load calculations.Heating and cooling system design <br /> loads for the purpose of sizing systems,appliances and eyuip- <br /> ment shall be determined in accordance with the procedures <br /> described in the ASHRAE/ACCA Standard 183. Alterna- <br /> tively, design loads shall be determined by an approved <br /> equivalent computation procedure, using the design parame- <br /> ters specified in Chapter 3 of the International Energy Con- <br /> servation Code. <br /> 2012 GN�"�F�EVIdl-10[VAL M�C@-9,r1NICAL CUD��" 29 <br />