Designation:E145−94(Reapproved2011)StandardSpecificationforGravity-ConvectionandForced-VentilationOvens1ThisstandardisissuedunderthefixeddesignationE145;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecificationcoverstheperformancerequirementsforgeneral-purposeairovensordinarilyusedintestingoperations,whichhaveatestingchamberupto0.6m3(25ft3)involume.Itisapplicabletogravity-convectionovensde-signedtooperateoverallorpartofthetemperaturerangefrom20°Caboveambienttemperatureto200°Candtoforced-ventilationovensdesignedtooperateoverallorpartofthetemperaturerangefrom20°Caboveambienttemperatureto500°C.NOTE1—Ovensaredesignedformaximumoperatingtemperaturesofabout200°C,300°C,and500°C,thethermalinsulationandcostoftheovenbeingdependentonthemaximumtemperaturerequired.1.2Thisspecificationdoesnotincludesafetyrequirementsthatareessentialforovensusedinthepresenceofcombustiblevaporsorgases.1.3Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Themetricequivalentsofinch-poundunitsmaybeapproximate.2.Types2.1Thisspecificationcoversthefollowingfourtypesofairovens:2.1.1TypeIA—Anovenventilatedbygravityconvectionhavingauniformityoftemperaturewithin62%ofthedifferentialbetweenovenandambienttemperatures.2.1.2TypeIB—Anovenventilatedbygravityconvectionhavingauniformityoftemperaturewithin65%ofthedifferentialbetweenovenandambienttemperatures.2.1.3TypeIIA—Anovenhavingforcedventilationandauniformityoftemperaturewithin61%ofthedifferentialbetweenovenandambienttemperatures.2.1.4TypeIIB—Anovenhavingforcedventilationandauniformityoftemperaturewithin62.5%ofthedifferentialbetweenovenandambienttemperatures.3.PerformanceRequirements3.1Thetemperaturewithinthetestingchambershallbecontrollablebya...
