CSA B149.1:20 National Standard of Canada

1 CSA :20 NationalStandardof CanadaNaturalgas and propaneinstallationcodeREVISEDMAY 2021 LegalNoticefor StandardsCanadianStandardsAssociation(op eratingas CSAG roup )developsstandardsthrougha consensusstandardsdevelopmentprocess approvedby the StandardsCouncilof processbringstogethervolunteers representingvariedviewpointsand interests to achieveconsensusand developa Groupadministers the processand establishesrulesto promotefairnessin achievingconsensus,it doesnot independentlytest, evaluate,or verifythe contentof exclusionof liabilityThis documentis providedwithoutany representations,warranties,or conditionsof any kind,expressor implied,including,withoutlimitation,impl iedwarrantiesor conditionsconcerningthis document s fitnessfor a particularpurposeor use, its merchantability, or its non-infringementof any thirdparty s Groupdoesnot warrantthe accuracy, completeness,or currencyof any of the informationpublishedin this Groupmakesno representationsor warrantiesregardingthis document s compliancewithany applicablestatute, rule.

2 Or NO EVENTSHALLCSA GROUP,ITS VOLUNTEERS,MEMBERS,SUBSIDIARIES,OR AFFILIATEDCOMPANIES,OR THEIREMPLOYEES,DIRECTORS,OR OFFICERS,BE LIABLEFOR ANY DIRECT,INDIRECT,OR INCIDENTALDAMAGES,INJURY,LOSS,COSTS,OR EXPENSES,HOWSOEVERCAUSED,INCLUDINGBUT NOTLIMITEDTO SPECIALOR CONSEQUENTIALDAMAGES,LOSTREVENUE,BUSINES SINTERRUPTION,LOSTOR DAMAGEDDATA,OR ANY OTHERCOMMERCIALOR ECONOMICLOSS,WHETHERBASEDIN CONTRACT,TORT(INCLUDINGNEGLIGENCE),OR ANY OTHERTHEORYOF LIABILITY,ARISINGOUTOF OR RESULTINGFROMACCESSTO OR POSSESSIONOR USE OF THISDOCUMENT,EVENIF CSA GROUPHAS BEENADVISEDOF THE POSSIBILITYOF SUCHDAMAGES,INJURY,LOSS,COSTS,OR publishingand makingthis documentavailable,CSA Groupis not undertakingto renderprofessionalor otherservicesfor or on behalfof anypersonor entityor to performany dutyowedby any personor entityto anotherpersonor entity. The informationin this documentis directedto thosewho havethe appropriate degreeof experienceto use and applyits contents, and CSA Groupacceptsno responsibilitywhatsoeverarisingin any way fromany and all use of or relianceon the informationcontainedin this Groupis a privatenot-for-profitcompanythat publishesvoluntarystandardsand Grouphas no power, nor doesitundertake,to enforcecompliancewiththe contentsof the standardsor otherdocumentsit ownershipAs betweenCSA Groupand the usersof this document(whetherit be in printed or electronicform),CSA Groupis the owner, or the authorizedlicensee,of all workscontainedhereinthat are protected by copyright,all trade-marks(exceptas otherwisenoted to the contrary)

3 ,and allinventionsand tradesecretsthat may be containedin this document,whetheror not suchinventionsand tradesecretsare protectedbypatentsand applicationsfor ,the unauthorizeduse, modification,copying,or disclosureof this documentmayviolatelawsthat protect CSA Group sand/orothers intellectualpropertyand may give rise to a rightin CSA Groupand/orothersto seeklegalredressfor suchuse, modification,copying,or the extentpermitted by licenceor by law, CSA Groupreservesall intellectualpropertyrightsin this drawnto the possibilitythat someof the elementsof this standardmay be the subjectof Groupshallnot beheld responsiblefor identifyingany or all this standardare expresslyadvisedthat determinationof the validityofany suchpatentrightsis entirelytheirown of this documentThis documentis beingprovidedby CSA Groupfor informationaland non-commercialuse only. The user of this documentis authorizedto doonly the following:If this documentis in electronicform: load this documentontoa computerfor the sole purposeof reviewingit; searchand browse this document;and printthis documentif it is in PDF this documentin printor paperformmay be distributed only to personswho are authorizedby CSA Groupto havesuchcopies,and only if this LegalNoticeappears on addition,usersmay not and may not permitothersto alterthis documentin any way or removethis LegalNoticefromthe attachedstandard; sell this documentwithoutauthorizationfromCSA Group;or makean electroniccopyof this you do not agreewithany of the termsand conditionscontainedin this LegalNotice,you may not load or use this documentor makeanycopiesof the contentshereof,and if you do makesuchcopies,you are requiredto destroy themimmediately.

4 Use of this documentconstitutes youracceptanceof the termsand conditionsof this HistoryCSA :20, Natural gas and propane installation codeAdministrative update May 2021 Index 2021 2020 CanadianStandardsAssociation1 CSA :20 AdministrativeupdateThe followingis a list of revisions,additionsand deletionsto CSA :20:Administrative update May2021 May 2021 2020 CanadianStandardsAssociation2 CSA :20 AdministrativeupdateIndexAAbbreviationso rganizations, phrases, alsoInstallationaccessopening, rooftop installations, (a)ladders, (b)passagewayto appliance, , servicing, , rooftopinstallations, , definition,3 Air alsoVentilationappliancesboilers, , , , , (b), , water heaters , 400 000 Btuh, 000 Btu/h, devices, , , , air, , , , , , , , , , , , , , , , , , ,3requirementsfor appliances, , , , louvresand grilles, ,3ducts, , , , , , rectangularducts, , , definition,3flue gas dilutionair, 3generalrequirements, , , , , mechanicalmeans, , , supplyfree areafor appliancewithdraftcontrol, , areafor appliancewithoutdraftcontrol, , , definition,3 Aircrafthangar,SeeBuildingMay 2021 2020 CanadianStandardsAssociation3 CSA :20 AdministrativeupdateAircraftstorageor servicingareas, , pressuredrop, , , alsoAir supply;Boilers;Chimneys;Clothesdryers.

5 Cookingappliances;Counterappliances;Furn aces;Gas logs and decorativeappliances; heaters ; Hotplates; Incinerators; Ranges;Stationarygas engine;Venting;Ventsand Chimneysaccessibility, pressuredrop, , , , appliancesdefinition,3typeof ventingsystem to be used, , , , ,AnnexCCategoryII appliancesdefinition,3typeof ventingsystem to be used, appliancesdefinition,3typeof ventingsystem to be used, appliancesdefinition,3typeof ventingsystem to be used, combustible material, , , , , , , , ,3dirt pockets, , damagedand usedequipment, , , shows,exhibitionsor othersimilarevents, ,AnnexMoutdoorinstallations, physicaldamage, (RFAs), , valves, use, , , (b)unvented appliances, , (VFA), , , (e), (a), , , gas required, 2021 2020 CanadianStandardsAssociation4 CSA :20 Administrativeupdatedeviations, , ,definition,3 Assemblybuilding,SeeBuildingAuthorityhav ingjurisdiction, , , , , , , , , , , , , , , , , , , , , , , , , ,and ,3 Authorizedperson, , , , damper,SeeFlue damperAutomaticventdamperdevice, ventdamperdevice, ,3definition,3 Thermallyactuatedventdamperdevice, ,3 BBackcheckvalve,SeeValvesBaffle(neutralp ressurepointadjuster), , ,3installationof decorativeappliance, roomheater, water heater, ,3installationof decorativeappliances, water heater, hotplates, ranges, roomsdefinition,3installationof decorativeappliances, hotplates, installationof ranges, ,3, supplydetermination, , flue outlet, , ,3installation, 2021 2020 CanadianStandardsAssociation5 CSA.

6 20 AdministrativeupdateBranchline, , , ,3 Branchpipingoutlets, , , ,3applianceventing, , , , ,3care or detentionoccupancybuilding, , , , (c), ,3commercialbuilding, ,3definition,3deliverypressure, , , building, , ,3odorization, gas enginesand turbinesin, , , ,3shut-off valve, tubing, , , , , (b), , ,3 Burner, , , , , , ,3fan-assisted burner, (b)definition,3forced-draftburner, ,3natural-draftburner, (a)definition,3 Bushingsmaterials, , wash, , , (d)Carbonmonoxidesensors, , detention occupancybuilding,SeeBuildingCatalytiche ater,SeeHeaterCategoryI appliances,SeeAppliancesCategoryII appliances,SeeAppliancesCategoryIII appliances,SeeAppliancesMay 2021 2020 CanadianStandardsAssociation6 CSA :20 AdministrativeupdateCategoryIV appliances,SeeAppliancesCertified,defini tion,3 Chase,piping, , ,SeeRecreationalvehicleChimneydraft, alsoVenting;Ventsand chimneysclean-outopening, , and oil-burningappliances, drain, , , , , ,3factory-builtchimney, , , , , , ,3flue serving, , , , , ,AnnexCmasonryor concretechimney, , ,3metalchimney(smokestack), , ,3liner, , ,AnnexCsupport, , , , air supply, ,8 Clearancesappliancesboilers, , , , heaters and torches, , , heaters , heaters , heaters , , , plates, , , (i), , , 400 000 Btuh, , , , 2021 2020 CanadianStandardsAssociation7 CSA.

7 20 Administrativeupdateresidentialrange, , , , heaters , , , , (generalrequirements), , , , , , , discharge, , servicingarea, car wash, edge, (b)reducedclearances, , ventconnector, , ,prohibited, , type, exhaust ducts, , , ,definition,3 Combustibledust or fibres, air,SeeAir supplyCombustion productsdefinition,3dischargedirectlyint o space, direct-fireddoorair heater, safetycontrol, ,3 Commercial-and industrial-typeapplianceor equipment, , ,3 Commercialbuilding,SeeBuildingCommercial cookingappliance, , , , ,3 Commondischargeheader, alsoVenting;Ventsand chimneys, , , , , , , ,definition,3 Compressors, ,AnnexNConcealedpipingor tubing, ,3 Condensate, , , alsoAppliances;Installation, , , , , , , 2021 2020 CanadianStandardsAssociation8 CSA :20 Administrativeupdatecorrugated metal, , , ,definition,3mobilehomes, compressors, and torches,SeeHeaterContainer, definition,3 Continuouspilot,SeePilotControlcircuit,l ow-voltage, burners, , , , approval, , (d)fuel oil systems, (b)furnacesgeneralrequirements, , , , , ,definitions,3applianceswithcasters, , , valve, (a)residential-typeranges, , , , , chemical, location, connector, appliances, burrs, , ,SeeValvesCylindersdefinition, cylindersDDamagedappliances, supplyopenings, , 2021 2020 CanadianStandardsAssociation9 CSA.

8 20 Administrativeupdategeneralrequirements, , , ,3manuallyoperated flue dampers, , , , logs and decorativeappliancesDefinitions,3 Deliverypressure, 2 psig (14 kPa) or less, than2 psig (14 kPa), ,3 Depressurization,definition,3 Designpressure, ,3 Deviations, air heater (DFIAH),SeeHeaterDirectgas-firedprocess air heater (DFPAH),SeeHeaterDirectventappliancesloc ation, , , , , , ,definition,3 Direct-firedmake-upair heater (DFMAH),SeeHeaterDirect-firedvaporizer,S eeVaporizerDirect-ventappliance, , , , , , , , , , ,3 Dirt pocketsdefinition,3requirements, products, reliefdevices, , , , , , , , , (c)Diversity of load, ,SeeDraft-controldeviceDraftregulators,S eeDraft-controldeviceDraft-control device, , , , , , , , , , ,3drafthoods, ventingsystem, , ,3generaldimensions,AnnexFprohibited on incinerator, , withcommongas vent, 2021 2020 CanadianStandardsAssociation10 CSA :20 Administrativeupdateuse withTypeB vent, , , ,3incinerators, , , , , ,definition,3control devices, ,3induced-or forced-devices, ,definition,3forceddraftdefinition,3devi ces, ,3devices, , , pocketsdefinition,3requirements, supply;Venting.

9 Ventsand chimneysDuctworkconnections, pocketsDwellingunit, , , , , , , , , , , , , ,3defectiveheatexchanger, (neargas leakage), (conversions), (d)Electricalconnectionsand components, , ventdamperdevice,SeeAutomaticventdamperd eviceElevatorshaftinstallationof DFIAH, DFMAH, pipingand tubing, , , ,3 Emergencyshut-off valve,SeeValvesEnclosure,definition,3 Engine, , ,3reciprocatingengine,definition,3 May 2021 2020 CanadianStandardsAssociation11 CSA :20 Administrativeupdateturbineengine,defini tion,3 Equipment,definition,3 Equivalentlengthresistanceof bends,fittings,and valves, ,SeeAir supplyExcess-flowvalve,SeeValvesExhaust hoodor canopy, , ,SeePilotExplosivemixture, ,SeeChimneysFalseceilingspace, , , ,3 FAN Max,definition,3 FAN Min,definition,3 Fan-assisted appliances,AnnexCFan-assisted burner, (b)definition,3 Fan-assisted combustion system, definition,3 FAN+FAN,definition,3 FAN+NAT,definition,3 Fast-closingvalve,SeeValvesFireplacescon ditionscreatedby, ,3installationof decorativeappliance, roomheater, , , , ,3job-fabricated welded, , , vehiclerefuellingappliances(VRAs), fittings, (copper), (expressedin equivalentlengthof pipe), , , , , fittings, , , , pipingsystems, , , ,3 Flamesafeguard(not provided)

10 , alsoCombustion safetycontrolFlammableliquid, ,3 Flammablevapours, , , , ,definition,3 Floorfurnace, , , 2021 2020 CanadianStandardsAssociation12 CSA :20 Administrativeupdatedefinition,3 Flue,definition,3 Flue backflowpreventer, ,3 Flue collar, , , , , , , , ,3 Flue damper, , damper, ,3definition,3manuallyoperated flue damper, ,3 Flue gasdefinition,3dilutionair, 3temperature, ,SeeDraftForced-draftburner, definition,3 Fuel oil systems (conversions), (b) (RFA);Vehiclefuelingappliance(VFA)Furnac esair supplyrequirements, , , , (b), , , (c), temperaturelimitcontrol, , , ,3downflow, , , , , ,definition,3 Garagesappliancesin, ,3installationof infraredheaters, , unit heaters , garage,definition,3repairgarage, ,3storagegarage, ,3 May 2021 2020 CanadianStandardsAssociation13 CSA :20 Administrativeupdateinstallationof DFIAH, DFMAH, connector, , , ,3 Gas convenienceoutlet, , ,3 Gas engine,See alsoStationarygas engine, hose, ,3installationof infraredheaters, compressor, logs and decorativeappliances, and dirt pockets, , , , , pipingsystem, 6definition,3mobilehomes, testing, , gas for sizing, , , , , AnnexNcarbondioxide.