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GENERAL REGULATIOiVS <br /> TABLE 308.6 <br /> ( CLEARANCE REDUCTION METHODSb <br /> REDUCED CLEARANCE WITH PROTECTION(inches)� <br /> Horizontal combustible assembiies <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)' witfiout 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 /> 24 gage),mounted on 1-inch glass fiber or mineral wool batt reinforced with wire on <br /> � the back,1 inch off the combustible assembly <br /> Galvanized sheet steel,having a minimum thickness of 0.0236 inch(0.6010 mm)(No. 18 9 5 3 12 6 3 2 <br /> 24 gage),spaced 1 inch off the combustiblc assembly <br /> Two layers of galvanizcd sheet steel,having a minimum thickness of 0.0236 inch 18 9 5 3 1?. 6 3 3 <br /> (0.6010 mm)(Nu.2h gage),haviiig a 1-inch vrspace behvicen Inyc�s,spuced 1 inch <br /> off tlie combustible assembly <br /> Two]ayers of galvanized sheet s[eel,having a minimum thickness of 0.0236 inch 18 9 5 3 12 6 3 3 <br /> (0.6010 mm)(No.24 gage),having 1 inch of fiberglass insulation hetween layers, <br /> spaced 1 inch off the comUustible assentbly <br /> 0.5-inch inorganic insulating boazd,over 1 inch of fiberglass or mineral wool ba�t, 24 12 6 4 18 9 5 3 <br /> against the combustiUle assembly <br /> 3�/Z inch brick wall,spaced 1 inch off the combustible wall — 12 6 6 6 <br /> 3'/z inch brick wall,against the com6ustible wall — 24 12 6 5 <br /> For SI: 1 inch=25.4 mm,°C=[(°F)-32)/1.8,1 pound per cubic foot=16.02 kg/m3, 1.0 Btu•in/ft2•h•°F=0.144 W/m2•K. <br /> a. Mineral wool and glass fiber batts(blanket or boazd)shall have a minimum densiry of 8 pounds per cubic foot and a minimum melting point of 1,500°F. <br /> Insulation material urilized as part of a clearance reduction system shall have a thermal conductivity of 1.0 Btu•in/(ft�•h•°F)or less.Insulation boazd shall <br /> be formed of noncombustible material. <br /> b. For limitations on cleazance reduction for solid fuel-burning appliances,masonry chimneys,connector pass-throughs,masonry 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]3111 Required.Approved smoke and heat vents sha11 be <br /> installcd in tl�ic roo�f5 of onc-story buildinbs�vhcrc requirc�l by <br /> the Interraational Fire Code. 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 /> 312.1 Load calculations.Heating and cooling system design <br /> loads for the purpose of sizing systems,appliances and equip- <br /> ment shall be deteimined in accordance with the procedures <br /> described in the ASFIR.AE/ACCA Standard 183. Alterna- <br /> tively, design Ioads 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 /> � <br /> 2092 9iVi�RNATIONAL Ni��h9ANfCG.L CC3DE`, 29 <br />