Designation:E1998−11(Reapproved2018)StandardGuideforAssessingDepressurization-InducedBackdraftingandSpillagefromVentedCombustionAppliances1ThisstandardisissuedunderthefixeddesignationE1998;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidedescribesandcomparesdifferentmethodsforassessingthepotentialfor,orexistenceof,depressurization-inducedbackdraftingandspillagefromventedresidentialcombustionappliances.1.2Assessmentofdepressurization-inducedbackdraftingandspillageisconductedundereitherinduceddepressurizationornaturalconditions.1.3Residentialventedcombustionappliancesaddressedinthisguideincludehotwaterheatersandfurnace.Theguidealsoisapplicabletoboilers.1.4ThemethodsgiveninthisguideareapplicabletoCategoryI(draft-hood-andinduced-fan-equipped)furnaces.TheguidedoesnotapplytoCategoryIII(power-vent-equipped)orCategoryIV(direct-vent)furnaces.1.5Themethodsinthisguidearenotintendedtoidentifybackdraftingorspillageduetoventblockageorheat-exchangerleakage.1.6Thisguideisnotintendedtoprovideabasisfordeterminingcompliancewithcoderequirementsonapplianceandventinginstallation,butdoesincludeavisualassessmentoftheinstallation.Thisassessmentmayindicatetheneedforathoroughinspectionbyaqualifiedtechnician.1.7Usersofthemethodsinthisguideshouldbefamiliarwithcombustionapplianceoperationandwithmakinghouse-tightnessmeasurementsusingablowerdoor.Somemethodsdescribedinthisguiderequirefamiliaritywithdifferential-pressuremeasurementsanduseofcomputer-baseddata-loggingequipment.1.8ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.9Thisguidedoesnotpurporttoaddressallsafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheusertoestablishappropriatesafety,health,andenvi-ronmentalpracticesandtodeterminetheapplicabil...
