209OccupationalSafetyandHealthAdmin.,Labor§1926.155TABLEF–4—ContinuedHeatingappliancesMinimumclearance,(inches)SidesRearChimneycon-nectorRoomheater,radianttype..363618(3)Heatersnotsuitableforuseonwoodfloorsshallnotbesetdirectlyuponthemorothercombustiblemate-rials.Whensuchheatersareused,theyshallrestonsuitableheatinsulatingmaterialoratleast1-inchconcrete,orequivalent.Theinsulatingmaterialshallextendbeyondtheheater2feetormoreinalldirections.(4)Heatersusedinthevicinityofcombustibletarpaulins,canvas,orsimilarcoveringsshallbelocatedatleast10feetfromthecoverings.Thecoveringsshallbesecurelyfastenedtopreventignitionorupsettingoftheheaterduetowindactiononthecov-eringorothermaterial.(c)Stability.Heaters,wheninuse,shallbesethorizontallylevel,unlessotherwisepermittedbythemanufac-turer’smarkings.(d)Solidfuelsalamanders.Solidfuelsalamandersareprohibitedinbuildingsandonscaffolds.(e)Oil-firedheaters.(1)Flammableliquid-firedheatersshallbeequippedwithaprimarysafetycontroltostoptheflowoffuelintheeventofflamefailure.Barometricorgravityoilfeedshallnotbeconsideredaprimarysafe-tycontrol.(2)Heatersdesignedforbarometricorgravityoilfeedshallbeusedonlywiththeintegraltanks.(3)[Reserved](4)Heatersspecificallydesignedandapprovedforusewithseparatesupplytanksmaybedirectlyconnectedforgravityfeed,oranautomaticpump,fromasupplytank.§1926.155Definitionsapplicabletothissubpart.(a)Approved,forthepurposeofthissubpart,meansequipmentthathasbeenlistedorapprovedbyanationallyrecognizedtestinglaboratorysuchasFactoryMutualEngineeringCorp.,orUnderwriters’Laboratories,Inc.,orFederalagenciessuchasBureauofMines,orU.S.CoastGuard,whichissueapprovalsforsuchequipment.(b)Closedcontainermeansacontainersosealedbymeansofalidorotherde-vicethatneitherliquidnorvaporwillescapefromitatordinarytempera-tures.(c)Combustibleliquidsmeananyliq-uidhavingaflashpointatorabove140°F.(60°C.),andbelow200°F.(93.4°C.).(d)Combustionmeansanychemicalprocessthatinvolvesoxidationsuffi-cienttoproducelightorheat.(e)Firebrigademeansanorganizedgroupofemployeesthatareknowl-edgeable,trained,andskilledinthesafeevacuationofemployeesduringemergencysituationsandinassistinginfirefightingoperations.(f)Fireresistancemeanssoresistanttofirethat,forspecifiedtimeandunderconditionsofastandardheatin-tensity,itwillnotfailstructurallyandwillnotpermitthesideawayfromthefiretobecomehotterthanaspecifiedtemperature.Forpurposesofthispart,fireresistanceshallbedeterminedbytheStandardMethodsofFireTestsofBuildingConstructionandMaterials,NFPA251–1969.(g)Flammablemeanscapableofbeingeasilyignited,burningintensely,orhavingarapidrateofflamespread.(h)Flammableliquidsmeansanyliq-uidhavingaflashpointbelow140°F.andhavingavaporpressurenotex-ceeding40poundspersquareinch(ab-solute)at100°F.(i)Flashpointoftheliquidmeansthetemperatureatwhichitgivesoffvaporsufficienttoformanignitablemixturewiththeairnearthesurfaceoftheliq-uidorwithinthevesselusedasdeter-minedbyappropriatetestprocedureandapparatusasspecifiedbelow.(1)Theflashpointofliquidshavingaviscositylessthan45SayboltUni-versalSecond(s)at100°F.(37.8°C.)andaflashpointbelow175°F.(79.4°C.)shallbedeterminedinaccordancewiththeStandardMethodofTestforFlashPointbytheTagClosedTester,ASTMD–56–69.(2)Theflashpointofliquidshavingaviscosityof45SayboltUniversalSec-ond(s)ormoreat175°F.(79.4°C.)orhighershallbedeterminedinaccord-ancewiththeSta...
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