Designation:D3464−96(Reapproved2014)StandardTestMethodforAverageVelocityinaDuctUsingaThermalAnemometer1ThisstandardisissuedunderthefixeddesignationD3464;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethoddescribesthemeasurementoftheaveragevelocitywithathermalanemometerforthepurposeofdetermininggasflowinastack,duct,orflue(1-5).2Itislimitedtothoseapplicationswherethegasisessentiallyairatambientconditionsandthetemperature,moisture,andcontaminantloadingareinsignificantassourcesoferrorcomparedtothebasicaccuracyofthetypicalfieldsituation.1.2Therangeofthetestmethodisfrom1to30m/s(3to100ft/s).1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresD3796PracticeforCalibrationofTypeSPitotTubes2.2OtherStandards:ASMEPTC19.5-72ApplicationofFluidMeters,SixthEd.1971(InterimSupplement19.5onInstruments&Appa-ratus)43.Terminology3.1Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyD1356.4.SummaryofTestMethod4.1Thistestmethoddescribestheoperationalandcalibra-tionproceduresnecessaryforthemeasurementofpointveloc-ityandcalculationoftheaveragevelocityofairorgasflowsinflues,ducts,orstacksutilizingathermalanemometer.5.SignificanceandUse5.1Themethodpresentedisa“shortmethod”thatmaybeusedwherecontaminationlevelsarelessthan5000ppmbyweightorvolume,temperaturesarebetween0°C(32°F)and65°C(150°F),andthehumidityisnotconsidered.Thegasisconsideredasstandar...
