1

2015 IPC CODE – CHAPTERS 8-9 SECTIONS 801-918.8

INDIRECT/SPECIAL WASTE Changes to the 2012 Code are highlighted in yellow. SECTION801-GENERAL

801.1Scope.

Thischaptershallgovernmattersconcerningindirectwastepipingandspecialwastes.This

chaptershallfurthercontrolmattersconcerningfood-handlingestablishments,sterilizers,

clear-waterwastes,waste,swimmingpools,methodsofprovidingairbreaksorairgaps,and

neutralizingdevicesforcorrosivewastes.

801.2Protection.

Devices,appurtenances,appliancesandapparatusintendedtoservesomespecialfunction,

suchassterilization,distillation,processing,cooling,orstorageoficeorfoods,andthat

dischargetothedrainagesystem,shallbeprovidedwithprotectionagainstbackflow,flooding,

fouling,contaminationandstoppageofthedrain.

SECTION802-INDIRECTWASTES

802.1Whererequired.

Food-handlingequipment,inotherthandwellingunits,clear-waterwaste,dishwashing

machinesandutensils,pots,pansanddishwashingsinksshalldischargethroughanindirect

wastepipeasspecifiedinSections802.1.1through802.1.8.Health-carerelatedfixtures,devices

andequipmentshalldischargetothedrainagesystemthroughanindirectwastepipebymeans

ofanairgapinaccordancewiththischapterandSection713.3.Fixturesnotrequiredbythis

sectiontobeindirectlyconnectedshallbedirectlyconnectedtotheplumbingsystemin

accordancewithChapter7.

802.1.1Foodhandling.

Equipmentandfixturesutilizedforthestorage,preparationandhandlingoffoodshall

dischargethroughanindirectwastepipebymeansofanairgap.Eachwellofamultiple-

compartmentsinkshalldischargeindependentlytoawastereceptor.

2

802.1.2Floordrainsinfoodstorageareas.

Floordrainslocatedwithinwalk-inrefrigeratorsorfreezersinfoodserviceandfood

establishmentsshallbeindirectlyconnectedtothesanitarydrainagesystembymeans

ofanairgap.Whereafloordrainislocatedwithinanareasubjecttofreezing,thewaste

lineservingthefloordrainshallnotbetrappedandshallindirectlydischargeintoa

wastereceptorlocatedoutsideoftheareasubjecttofreezing.

Exception:Whereprotectedagainstbackflowbyabackwatervalve,suchfloor

drainsshallbeindirectlyconnectedtothesanitarydrainagesystembymeansof

anairbreakoranairgap.

802.1.3Potableclear-waterwaste.

Wheredevicesandequipment,suchassterilizersandreliefvalves,dischargepotable

watertothebuildingdrainagesystem,thedischargeshallbethroughanindirectwaste

pipebymeansofanairgap.

802.1.4Swimmingpools.

Wherewastewaterfromswimmingpools,backwashfromfiltersandwaterfrompool

deckdrainsdischargetothebuildingdrainagesystem,thedischargeshallbethroughan

indirectwastepipebymeansofanairgap.

802.1.5Nonpotableclear-waterwaste.

Wheredevicesandequipmentsuchasprocesstanks,filters,dripsandboilersdischarge

nonpotablewatertothebuildingdrainagesystem,thedischargeshallbethroughan

indirectwastepipebymeansofanairbreakoranairgap.

802.1.6Domesticdishwashingmachines.

Domesticdishwashingmachinesshalldischargeindirectlythroughanairgaporairbreak

intoawastereceptorinaccordancewithSection802.2,ordischargeintoawyebranch

fittingonthetailpieceofthekitchensinkorthedishwasherconnectionofafoodwaste

disposer.Thewastelineofadomesticdishwashingmachinedischargingintoakitchen

sinktailpieceorfoodwastedisposershallconnecttoadeck-mountedairgaporthe

wastelineshallriseandbesecurelyfastenedtotheundersideofthesinkrimor

counter.

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802.1.7Commercialdishwashingmachines.

Thedischargefromacommercialdishwashingmachineshallbethroughanairgaporair

breakintoawastereceptorinaccordancewithSection802.2.

802.1.8Foodutensils,dishes,potsandpanssinks.

Sinks,inotherthandwellingunits,usedforthewashing,rinsingorsanitizingofutensils,

dishes,pots,pansorservicewareusedinthepreparation,servingoreatingoffoodshall

dischargeindirectlythroughanairgaporanairbreaktothedrainagesystem.

802.2Installation.

Indirectwastepipingshalldischargethroughanairgaporairbreakintoawastereceptor.

Wastereceptorsshallbetrappedandventedandshallconnecttothebuildingdrainagesystem.

Indirectwastepipingthatexceeds30inches(762mm)indevelopedlengthmeasured

horizontally,or54inches(1372mm)intotaldevelopedlength,shallbetrapped.

Exception:Whereawastereceptorreceivesonlyclearwaterwasteanddoesnotdirectly

connecttoasanitarydrainagesystem,thereceptorshallnotrequireatrap.

802.2.1Airgap.

Theairgapbetweentheindirectwastepipeandthefloodlevelrimofthewaste

receptorshallbenotlessthantwicetheeffectiveopeningoftheindirectwastepipe.

802.2.2Airbreak.

Anairbreakshallbeprovidedbetweentheindirectwastepipeandthetrapsealofthe

wastereceptor.

802.3Wastereceptors.

Forotherthanhubdrainsthatreceiveonlyclear-waterwasteandstandpipes,aremovable

strainerorbasketshallcovertheoutletofwastereceptors.Wastereceptorsshallnotbe

installedinconcealedspaces.Wastereceptorsshallnotbeinstalledinplenums,crawlspaces,

attics,interstitialspacesaboveceilingsandbelowfloors.Readyaccessshallbeprovidedto

wastereceptors.

802.3.1Sizeofreceptors.

Awastereceptorshallbesizedforthemaximumdischargeofallindirectwastepipes

servedbythereceptor.Receptorsshallbeinstalledtopreventsplashingorflooding.

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802.3.2Hubdrains.

Ahubdrainshallbeintheformofahuborapipeextendingnotlessthan1inch(25

mm)aboveawater-imperviousfloor.

802.3.3Standpipes.

Standpipesshallbeindividuallytrapped.Standpipesshallextendnotlessthan18inches

(457mm)butnotgreaterthan42inches(1066mm)abovethetrapweir.Accessshallbe

providedtostandpipesanddrainsforrodding.

SECTION803-SPECIALWASTES

803.1Neutralizingdevicerequiredforcorrosivewastes.

Corrosiveliquids,spentacidsorotherharmfulchemicalsthatdestroyorinjureadrain,sewer,

soilorwastepipe,orcreatenoxiousortoxicfumesorinterferewithsewagetreatment

processesshallnotbedischargedintotheplumbingsystemwithoutbeingthoroughlydiluted,

neutralizedortreatedbypassingthroughanapproveddilutionorneutralizingdevice.Such

devicesshallbeautomaticallyprovidedwithasufficientsupplyofdilutingwaterorneutralizing

mediumsoastomakethecontentsnoninjuriousbeforedischargeintothedrainagesystem.

Thenatureofthecorrosiveorharmfulwasteandthemethodofitstreatmentordilutionshall

beapprovedpriortoinstallation.

803.2Systemdesign.

Achemicaldrainageandventsystemshallbedesignedandinstalledinaccordancewiththis

code.Chemicaldrainageandventsystemsshallbecompletelyseparatedfromthesanitary

systems.Chemicalwasteshallnotdischargetoasanitarydrainagesystemuntilsuchwastehas

beentreatedinaccordancewithSection803.1.

SECTION804-MATERIALS,JOINTSANDCONNECTIONS

804.1General.

Thematerialsandmethodsutilizedfortheconstructionandinstallationofindirectwastepipes

andsystemsshallcomplywiththeapplicableprovisionsofChapter7.

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2015 IPC CODE - CHAPTER 9 VENTS

SECTION901-GENERAL

901.1Scope.

Theprovisionsofthischaptershallgovernthematerials,design,constructionandinstallationof

ventsystems.

901.2Trapsealprotection.

Theplumbingsystemshallbeprovidedwithasystemofventpipingthatwillpermitthe

admissionoremissionofairsothatthesealofanyfixturetrapshallnotbesubjectedtoa

pressuredifferentialofmorethan1inchofwatercolumn(249Pa).

901.2.1Ventingrequired.

Trapsandtrappedfixturesshallbeventedinaccordancewithoneoftheventing

methodsspecifiedinthischapter.

901.3Chemicalwasteventsystems.

Theventsystemforachemicalwastesystemshallbeindependentofthesanitaryventsystem

andshallterminateseparatelythroughtherooftotheoutdoorsortoanairadmittancevalve

thatcomplieswithASSE1049.Airadmittancevalvesforchemicalwastesystemsshallbe

constructedofmaterialsapprovedinaccordancewithSection702.5andshallbetestedfor

chemicalresistanceinaccordancewithASTMF1412.

901.4Uselimitations.

Theplumbingventsystemshallnotbeutilizedforpurposesotherthantheventingofthe

plumbingsystem.

901.5Tests.

TheventsystemshallbetestedinaccordancewithSection312.

901.6Engineeredsystems.

EngineeredventingsystemsshallconformtotheprovisionsofSection919.

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SECTION902-MATERIALS

902.1Vents.

Thematerialsandmethodsutilizedfortheconstructionandinstallationofventingsystems

shallcomplywiththeapplicableprovisionsofSection702.

902.2Sheetcopper.

SheetcopperforventpipeflashingsshallconformtoASTMB152andshallweighnotlessthan

8ouncespersquarefoot(2.5kg/m2).

902.3Sheetlead.

Sheetleadforventpipeflashingsshallweighnotlessthan3poundspersquarefoot(15kg/m2)

forfield-constructedflashingsandnotlessthan2½poundspersquarefoot(12kg/m2)for

prefabricatedflashings.

SECTION903-VENTTERMINALS

903.1Roofextension.

Openventpipesthatextendthrougharoofshallbeterminatednotlessthan[NUMBER]inches

(mm)abovetheroof.Wherearoofistobeusedforassemblyorasapromenade,observation

deck,sunbathingdeckorsimilarpurposes,openventpipesshallterminatenotlessthan7feet

(2134mm)abovetheroof.

903.2Frostclosure.

Wherethe97.5-percentvalueforoutsidedesigntemperatureis0°F(-18°C)orless,vent

extensionsthrougharooforwallshallbenotlessthan3inches(76mm)indiameter.Any

increaseinthesizeoftheventshallbemadenotlessthan1foot(305mm)insidethethermal

envelopeofthebuilding.

903.3Flashings.

Thejunctureofeachventpipewiththerooflineshallbemadewatertightbyanapproved

flashing.

903.4Prohibiteduse.

Aventterminalshallnotbeusedforanypurposeotherthanaventterminal.

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903.5Locationofventterminal.

Anopenventterminalfromadrainagesystemshallnotbelocateddirectlybeneathanydoor,

openablewindow,orotherairintakeopeningofthebuildingorofanadjacentbuilding,and

anysuchventterminalshallnotbewithin10feet(3048mm)horizontallyofsuchanopening

unlessitis3feet(914mm)ormoreabovethetopofsuchopening.

903.6Extensionthroughthewall.

Ventterminalsextendingthroughthewallshallterminateatapointnotlessthan10feet(3048

mm)fromalotlineandnotlessthan10feet(3048mm)aboveaveragegroundlevel.Vent

terminalsshallnotterminateundertheoverhangofastructurewithsoffitvents.Sidewallvent

terminalsshallbeprotectedtopreventbirdsorrodentsfromenteringorblockingthevent

opening.

903.7Extensionoutsideastructure.

Inclimateswherethe97.5percentvalueforoutsidedesigntemperatureislessthan0°F(-18°C),

ventpipesinstalledontheexteriorofthestructureshallbeprotectedagainstfreezingby

insulation,heatorboth.

SECTION904-OUTDOORVENTEXTENSIONS

904.1Requiredventextension.

Theventsystemservingeachbuildingdrainshallhavenotlessthanoneventpipethatextends

totheoutdoors.

904.1.1Installation.

Therequiredventshallbeadryventthatconnectstothebuildingdrainoranextension

ofadrainthatconnectstothebuildingdrain.Suchventshallnotbeanislandfixture

ventasallowedbySection916.

904.1.2Size.

TherequiredventshallbesizedinaccordancewithSection906.2basedontherequired

sizeofthebuildingdrain.

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904.2Ventstackrequired.

Aventstackshallberequiredforeverydrainagestackthathasfivebranchintervalsormore.

Exception:DrainagestacksinstalledinaccordancewithSection913.

904.3Venttermination.

Ventstacksorstackventsshallterminateoutdoorstotheopenairortoastack-typeair

admittancevalveinaccordancewithSection918.

904.4Ventconnectionatbase.

Ventstacksshallconnecttothebaseofthedrainagestack.Theventstackshallconnectator

belowthelowesthorizontalbranch.Wheretheventstackconnectstothebuildingdrain,the

connectionshallbelocateddownstreamofthedrainagestackandwithinadistanceof10times

thediameterofthedrainagestack.

904.5Ventheaders.

Stackventsandventstacksconnectedintoacommonventheaderatthetopofthestacksand

extendingtotheopenairatonepointshallbesizedinaccordancewiththerequirementsof

Section906.1.Thenumberoffixtureunitsshallbethesumofallfixtureunitsonallstacks

connectedthereto,andthedevelopedlengthshallbethelongestventlengthfromthe

intersectionatthebaseofthemostdistantstacktotheventterminalintheopenair,asa

directextensionofonestack.

SECTION905-VENTCONNECTIONSANDGRADES

905.1Connection.

Individual,branchandcircuitventsshallconnecttoaventstack,stackvent,airadmittance

valveorextendtotheopenair.

905.2Grade.

Ventandbranchventpipesshallbesogradedandconnectedastodrainbacktothedrainage

pipebygravity.

905.3Ventconnectiontodrainagesystem.

Everydryventconnectingtoahorizontaldrainshallconnectabovethecenterlineofthe

horizontaldrainpipe.

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905.4Verticalriseofvent.

Everydryventshallriseverticallytoapointnotlessthan6inches(152mm)abovetheflood

levelrimofthehighesttraportrappedfixturebeingvented.

Exception:Ventsforinterceptorslocatedoutdoors.

905.5Heightabovefixtures.

Aconnectionbetweenaventpipeandaventstackorstackventshallbemadeatnotlessthan

6inches(152mm)abovethefloodlevelrimofthehighestfixtureservedbythevent.

Horizontalventpipesformingbranchvents,reliefventsorloopventsshallbelocatednotless

than6inches(152mm)abovethefloodlevelrimofthehighestfixtureserved.

905.6Ventforfuturefixtures.

Wherethedrainagepipinghasbeenroughed-inforfuturefixtures,arough-inconnectionfora

ventshallbeinstalled.Theventsizeshallbenotlessthanone-halfthediameteroftherough-in

draintobeserved.Theventrough-inshallconnecttotheventsystem,orshallbeventedby

othermeansasprovidedforinthischapter.Theconnectionshallbeidentifiedtoindicatethat

itisavent.

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SECTION906-VENTPIPESIZING

906.1Sizeofstackventsandventstacks.

Theminimumrequireddiameterofstackventsandventstacksshallbedeterminedfromthe

developedlengthandthetotalofdrainagefixtureunitsconnectedtheretoinaccordancewith

Table906.1,butinnocaseshallthediameterbelessthanone-halfthediameterofthedrain

servedorlessthan1¼inches(32mm).

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906.2Ventsotherthanstackventsorventstacks.

Thediameterofindividualvents,branchvents,circuitventsandreliefventsshallbenotless

thanone-halftherequireddiameterofthedrainserved.Therequiredsizeofthedrainshallbe

determinedinaccordancewithTable710.1(2).Ventpipesshallnotbelessthan1¼inches(32

mm)indiameter.Ventsexceeding40feet(12192mm)indevelopedlengthshallbeincreased

byonenominalpipesizefortheentiredevelopedlengthoftheventpipe.Reliefventsforsoil

andwastestacksinbuildingshavingmorethan10branchintervalsshallbesizedinaccordance

withSection908.2.

906.3Developedlength.

Thedevelopedlengthofindividual,branch,circuitandreliefventsshallbemeasuredfromthe

farthestpointofventconnectiontothedrainagesystemtothepointofconnectiontothevent

stack,stackventorterminationoutsideofthebuilding.

906.4Multiplebranchvents.

Wheremultiplebranchventsareconnectedtoacommonbranchvent,thecommonbranch

ventshallbesizedinaccordancewiththissectionbasedonthesizeofthecommonhorizontal

drainagebranchthatisorwouldberequiredtoservethetotaldrainagefixtureunitloadbeing

vented.

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906.5Sumpvents.

SumpventsizesshallbedeterminedinaccordancewithSections906.5.1and906.5.2.

906.5.1Sewagepumpsandsewageejectorsotherthanpneumatic.

Drainagepipingbelowsewerlevelshallbeventedinthesamemannerasthatofa

gravitysystem.Buildingsumpventsizesforsumpswithsewagepumpsorsewage

ejectors,otherthanpneumatic,shallbedeterminedinaccordancewithTable906.5.1.

906.5.2Pneumaticsewageejectors.

Theairpressurereliefpipefromapneumaticsewageejectorshallbeconnectedtoan

independentventstackterminatingasrequiredforventextensionsthroughtheroof.

Thereliefpipeshallbesizedtorelieveairpressureinsidetheejectortoatmospheric

pressure,butshallbenotlessthaninches1¼inches(32mm)insize.

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SECTION907-VENTSFORSTACKOFFSETS

907.1Ventforhorizontaloffsetofdrainagestack.

Horizontaloffsetsofdrainagestacksshallbeventedwherefiveormorebranchintervalsare

locatedabovetheoffset.Theoffsetshallbeventedbyventingtheuppersectionofthe

drainagestackandthelowersectionofthedrainagestack.

907.2Uppersection.

Theuppersectionofthedrainagestackshallbeventedasaseparatestackwithaventstack

connectioninstalledinaccordancewithSection904.4.Theoffsetshallbeconsideredthebase

ofthestack.

907.3Lowersection.

Thelowersectionofthedrainagestackshallbeventedbyayokeventconnectingbetweenthe

offsetandthenextlowerhorizontalbranch.Theyokeventconnectionshallbepermittedtobe

averticalextensionofthedrainagestack.Thesizeoftheyokeventandconnectionshallbea

minimumofthesizerequiredfortheventstackofthedrainagestack.

SECTION908-RELIEFVENTS-STACKSOFMORETHAN10BRANCHINTERVALS

908.1Whererequired.

Soilandwastestacksinbuildingshavingmorethan10branchintervalsshallbeprovidedwitha

reliefventateachtenthintervalinstalled,beginningwiththetopfloor.

908.2Sizeandconnection.

Thesizeofthereliefventshallbeequaltothesizeoftheventstacktowhichitconnects.The

lowerendofeachreliefventshallconnecttothesoilorwastestackthroughawyebelowthe

horizontalbranchservingthefloor,andtheupperendshallconnecttotheventstackthrougha

wyenotlessthan3feet(914mm)abovethefloor.

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SECTION909-FIXTUREVENTS

909.1Distanceoftrapfromvent.

Eachfixturetrapshallhaveaprotectingventlocatedsothattheslopeandthedeveloped

lengthinthefixturedrainfromthetrapweirtotheventfittingarewithintherequirementsset

forthinTable909.1.

Exception:The

developed

lengthofthe

fixturedrain

fromthetrap

weirtothe

ventfittingfor

self-siphoning

fixtures,such

aswaterclosets,shallnotbelimited.

909.2Ventingoffixturedrains.

Thetotalfallinafixturedrainduetopipeslopeshallnotexceedthediameterofthefixture

drain,norshalltheventconnectiontoafixturedrain,exceptforwaterclosets,bebelowthe

weirofthetrap.

909.3Crownvent.

Aventshallnotbeinstalledwithintwopipediametersofthetrapweir.

SECTION910-INDIVIDUALVENT

910.1Individualventpermitted.

Eachtrapandtrappedfixtureispermittedtobeprovidedwithanindividualvent.Theindividual

ventshallconnecttothefixturedrainofthetraportrappedfixturebeingvented.

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SECTION911-COMMONVENT

911.1Individualventascommonvent.

Anindividualventispermittedtoventtwotrapsortrappedfixturesasacommonvent.The

trapsortrappedfixturesbeingcommonventedshallbelocatedonthesamefloorlevel.

911.2Connectionatthesamelevel.

Wherethefixturedrainsbeingcommonventedconnectatthesamelevel,theventconnection

shallbeattheinterconnectionofthefixturedrainsordownstreamoftheinterconnection.

911.3Connectionatdifferentlevels.

Wherethefixturedrainsconnectatdifferentlevels,theventshallconnectasavertical

extensionoftheverticaldrain.Theverticaldrainpipeconnectingthetwofixturedrainsshallbe

consideredtheventfor

thelowerfixturedrain,

andshallbesizedin

accordancewithTable

911.3.Theupperfixture

shallnotbeawater

closet.

SECTION912-WETVENTING

912.1Horizontalwetventpermitted.

Anycombinationoffixtureswithintwobathroomgroupslocatedonthesamefloorlevelis

permittedtobeventedbyahorizontalwetvent.Thewetventshallbeconsideredtheventfor

thefixturesandshallextendfromtheconnectionofthedryventalongthedirectionoftheflow

inthedrainpipetothemostdownstreamfixturedrainconnectiontothehorizontalbranch

drain.Eachwet-ventedfixturedrainshallconnectindependentlytothehorizontalwetvent.

Onlythefixtureswithinthebathroomgroupsshallconnecttothewet-ventedhorizontalbranch

drain.Anyadditionalfixturesshalldischargedownstreamofthehorizontalwetvent.

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912.1.1Verticalwetventpermitted.

Anycombinationoffixtureswithintwobathroomgroupslocatedonthesamefloorlevel

ispermittedtobeventedbyaverticalwetvent.Theverticalwetventshallbe

consideredtheventforthefixturesandshallextendfromtheconnectionofthedry

ventdowntothelowestfixturedrainconnection.Eachwet-ventedfixtureshallconnect

independentlytotheverticalwetvent.Waterclosetdrainsshallconnectatthesame

elevation.Otherfixturedrainsshallconnectaboveoratthesameelevationasthewater

closetfixturedrains.Thedry-ventconnectiontotheverticalwetventshallbean

individualorcommonventservingoneortwofixtures.

912.2Dryventconnection.

Therequireddry-ventconnectionforwet-ventedsystemsshallcomplywithSections912.2.1

and912.2.2.

912.2.1Horizontalwetvent.

Thedry-ventconnectionforahorizontalwet-ventsystemshallbeanindividualventora

commonventforanybathroomgroupfixture,exceptanemergencyfloordrain.Where

thedry-ventconnectstoawaterclosetfixturedrain,thedrainshallconnecthorizontally

tothehorizontalwet-ventsystem.Notmorethanonewet-ventedfixturedrainshall

dischargeupstreamofthedry-ventedfixturedrainconnection.

912.2.2Verticalwetvent.

Thedry-ventconnectionforaverticalwet-ventsystemshallbeanindividualventor

commonventforthemostupstreamfixturedrain.

912.3Size.

Thedryventservingthewetventshallbesizedbasedonthelargestrequireddiameterofpipe

withinthewet-ventsystem

servedbythedryvent.Thewet

ventshallbeofasizenotless

thanthatspecifiedinTable912.3,

basedonthefixtureunit

dischargetothewetvent.

17

SECTION913-WASTESTACKVENT

913.1Wastestackventpermitted.

Awastestackshallbeconsideredaventforallofthefixturesdischargingtothestackwhere

installedinaccordancewiththerequirementsofthissection.

913.2Stackinstallation.

Thewastestackshallbevertical,andbothhorizontalandverticaloffsetsshallbeprohibited

betweenthelowestfixturedrainconnectionandthehighestfixturedrainconnection.Fixture

drainsshallconnectseparatelytothewastestack.Thestackshallnotreceivethedischargeof

waterclosetsorurinals.

913.3Stackvent.

Astackventshallbeprovidedforthewastestack.Thesizeofthestackventshallbenotless

thanthesizeofthewastestack.Offsetsshallbepermittedinthestackvent,shallbelocatednot

lessthan6inches(152mm)abovethefloodlevelofthehighestfixtureandshallbein

accordancewithSection905.2.Thestackventshallbepermittedtoconnectwithother

stackventsandventstacksinaccordancewithSection904.5.

913.4Wastestacksize.

Thewastestackshallbesized

basedonthetotaldischargetothe

stackandthedischargewithina

branchintervalinaccordancewith

Table913.4.Thewastestackshall

bethesamesizethroughoutits

length.

SECTION914-CIRCUITVENTING

914.1Circuitventpermitted.

Amaximumofeightfixturesconnectedtoahorizontalbranchdrainshallbepermittedtobe

circuitvented.Eachfixturedrainshallconnecthorizontallytothehorizontalbranchbeing

circuitvented.Thehorizontalbranchdrainshallbeclassifiedasaventfromthemost

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downstreamfixturedrainconnectiontothemostupstreamfixturedrainconnectiontothe

horizontalbranch.

914.1.1Multiplecircuit-ventedbranches.

Circuit-ventedhorizontalbranchdrainsarepermittedtobeconnectedtogether.Each

groupofamaximumofeightfixturesshallbeconsideredaseparatecircuitventand

shallconformtotherequirementsofthissection.

914.2Ventconnection.

Thecircuitventconnectionshallbelocatedbetweenthetwomostupstreamfixturedrains.The

ventshallconnecttothehorizontalbranchandshallbeinstalledinaccordancewithSection

905.Thecircuitventpipeshallnotreceivethedischargeofanysoilorwaste.

914.3Slopeandsizeofhorizontalbranch.

Theslopeoftheventsectionofthehorizontalbranchdrainshallbenotgreaterthanoneunit

verticalin12unitshorizontal(8.3-percentslope).Theentirelengthoftheventsectionofthe

horizontalbranchdrainshallbesizedforthetotaldrainagedischargetothebranch.

914.3.1Sizeofmultiplecircuitvent.

Eachseparatecircuit-ventedhorizontalbranchthatisinterconnectedshallbesized

independentlyinaccordancewithSection914.3.Thedownstreamcircuit-vented

horizontalbranchshallbesizedforthetotaldischargeintothebranch,includingthe

upstreambranchesandthefixtureswithinthebranch.

914.4Reliefvent.

Areliefventshallbeprovidedforcircuit-ventedhorizontalbranchesreceivingthedischargeof

fourormorewaterclosetsandconnectingtoadrainagestackthatreceivesthedischargeof

soilorwastefromupperhorizontalbranches.

914.4.1Connectionandinstallation.

Thereliefventshallconnecttothehorizontalbranchdrainbetweenthestackandthe

mostdownstreamfixturedrainofthecircuitvent.Thereliefventshallbeinstalledin

accordancewithSection905.

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914.4.2Fixturedrainorbranch.

Thereliefventispermittedtobeafixturedrainorfixturebranchforfixtureslocated

withinthesamebranchintervalasthecircuit-ventedhorizontalbranch.Themaximum

dischargetoareliefventshallbefourfixtureunits.

914.5Additionalfixtures.

Fixtures,otherthanthecircuitventedfixtures,arepermittedtodischargetothehorizontal

branchdrain.Suchfixturesshallbelocatedonthesamefloorasthecircuit-ventedfixturesand

shallbeeitherindividuallyorcommonvented.

SECTION915-COMBINATIONWASTEANDVENTSYSTEM

915.1Typeoffixtures.

Acombinationwasteandventsystemshallnotservefixturesotherthanfloordrains,sinks,

lavatoriesanddrinkingfountains.Combinationwasteandventsystemsshallnotreceivethe

dischargefromafooddisposerorclinicalsink.

915.2Installation.

Theonlyverticalpipeofacombinationwasteandventsystemshallbetheconnectionbetween

thefixturedrainandthehorizontalcombinationwasteandventpipe.Theverticaldistanceshall

notexceed8feet(2438mm).

915.2.1Slope.

Theslopeofahorizontalcombinationwasteandventpipeshallnotexceedone-half

unitverticalin12units

horizontal(4-percent

slope)andshallnotbe

lessthanthatindicated

inTable704.1.

915.2.2Sizeandlength.

Thesizebethat

indicatedinTable

915.2.2unlimited.

20

915.2.3Connection.

Thecombinationwasteandventsystemshallbeprovidedwithadryventconnectedat

anypointwithinthesystemorthesystemshallconnecttoahorizontaldrainthatserves

ventedfixtureslocatedonthesamefloor.Combinationwasteandventsystems

connectingtobuildingdrainsreceivingonlythedischargefromoneormorestacksshall

beprovidedwithadryvent.Theventconnectiontothecombinationwasteandvent

pipeshallextendverticallytoapointnotlessthan6inches(152mm)abovetheflood

levelrimofthehighestfixturebeingventedbeforeoffsettinghorizontally.

915.2.4Ventsize.

TheventshallbesizedforthetotaldrainagefixtureunitloadinaccordancewithSection

906.2.

915.2.5Fixturebranchordrain.

Thefixturebranchorfixturedrainshallconnecttothecombinationwasteandvent

withinadistancespecifiedinTable909.1.Thecombinationwasteandventpipeshallbe

consideredtheventforthefixture.

SECTION916-ISLANDFIXTUREVENTING

916.1 Limitation.

Islandfixtureventingshallnotbepermittedforfixturesotherthansinksandlavatories.

Residentialkitchensinkswithadishwasherwasteconnection,afoodwastedisposer,orboth,

incombinationwiththekitchensinkwaste,shallbepermittedtobeventedinaccordancewith

thissection.

916.2Ventconnection.

Theislandfixtureventshallconnecttothefixturedrainasrequiredforanindividualor

commonvent.Theventshallriseverticallytoabovethedrainageoutletofthefixturebeing

ventedbeforeoffsettinghorizontallyorverticallydownward.Theventorbranchventfor

multipleislandfixtureventsshallextendtoapointnotlessthan6inches(152mm)abovethe

highestislandfixturebeingventedbeforeconnectingtotheoutsideventterminal.

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916.3Ventinstallationbelowthefixturefloodlevelrim.

Theventlocatedbelowthefloodlevelrimofthefixturebeingventedshallbeinstalledas

requiredfordrainagepipinginaccordancewithChapter7,exceptforsizing.Theventshallbe

sizedinaccordancewithSection906.2.Thelowestpointoftheislandfixtureventshallconnect

fullsizetothedrainagesystem.Theconnectionshallbetoaverticaldrainpipeortothetop

halfofahorizontaldrainpipe.Cleanoutsshallbeprovidedintheislandfixtureventtopermit

roddingofallventpipinglocatedbelowthefloodlevelrimofthefixtures.Roddinginboth

directionsshallbepermittedthroughacleanout.

SECTION917-SINGLESTACKVENTSYSTEM

917.1Wherepermitted.

Adrainagestackshallserveasasinglestackventsystemwheresizedandinstalledin

accordancewithSections917.2through917.9.Thedrainagestackandbranchpipingshallbe

theventsforthedrainagesystem.Thedrainagestackshallhaveastackvent.

917.2Stacksize.

Drainagestacksshallbe

sizedinaccordancewith

Table917.2.Stacksshallbe

uniformlysizedbasedon

thetotalconnected

drainagefixtureunitload.

Thestackventshallbethe

samesizeasthedrainage

stack.A3-inch(76mm)stackshallservenotmorethantwowaterclosets.

917.3Branchsize.

Horizontalbranchesconnectingtoasinglestackventsystemshallbesizedinaccordancewith

Table710.1(2).Notmorethanonewaterclosetshalldischargeintoa3-inch(76mm)horizontal

branchatapointwithinadevelopedlengthof18inches(457mm)measuredhorizontallyfrom

thestack.Whereawaterclosetiswithin18inches(457mm)measuredhorizontallyfromthe

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stackandnotmorethanonefixturewithadrainsizeofnotmorethan1½inches(38mm)

connectstoa3-inch(76mm)horizontalbranch,thebranchdrainconnectiontothestackshall

bemadewithasanitarytee.

917.4Lengthofhorizontalbranches.

ThelengthofhorizontalbranchesshallconformtotherequirementsofSections917.4.1

through917.4.3.

917.4.1Waterclosetconnection.

Waterclosetconnectionsshallbenotgreaterthan4feet(1219mm)indeveloped

lengthmeasuredhorizontallyfromthestack.

Exception:Wheretheconnectionismadewithasanitarytee,themaximum

developedlengthshallbe8feet(2438mm).

917.4.2Fixtureconnections.

Fixturesotherthanwaterclosetsshallbelocatednotgreaterthan12feet(3657mm)in

developedlength,measuredhorizontallyfromthestack.

917.4.3Verticalpipinginbranch.

Thelengthofverticalpipinginafixturedrainconnectingtoahorizontalbranchshallnot

beconsideredincomputingthefixture'sdistanceindevelopedlengthmeasured

horizontallyfromthestack.

917.5Minimumverticalpipingsizefromfixture.

Theverticalportionofpipinginafixturedraintoahorizontalbranchshallbe2inches(51mm).

Theminimumsizeoftheverticalportionofpipingforawater-suppliedurinalorstandpipeshall

be3inches(76mm).Themaximumverticaldropshallbe4feet(1219mm).Fixturedrainsthat

arenotincreasedinsize,orhaveaverticaldropinexcessof4feet(1219mm),shallbe

individuallyvented.

917.6Additionalventingrequired.

Additionalventingshallbeprovidedwheremorethanonewaterclosetdischargestoa

horizontalbranchandwherethedistancefromafixturetraptothestackexceedsthelimitsin

Section917.4.Whereadditionalventingisrequired,thefixture(s)shallbeventedbyindividual

vents,commonvents,wetvents,circuitvents,oracombinationwasteandventpipe.Thedry

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ventextensionsfortheadditionalventingshallconnecttoabranchvent,ventstack,stackvent,

airadmittancevalve,orshallterminateoutdoors.

917.7Stackoffsets.

Wherefixturedrainsarenotconnectedbelowahorizontaloffsetinastack,ahorizontaloffset

shallnotberequiredtobevented.Wherehorizontalbranchesorfixturedrainsareconnected

belowahorizontaloffsetinastack,theoffsetshallbeventedinaccordancewithSection907.

Fixtureconnectionsshallnotbemadetoastackwithin2feet(610mm)aboveorbelowa

horizontaloffset.

917.8Prohibitedlowerconnections.

Stacksgreaterthan2branchintervalsinheightshallnotreceivethedischargeofhorizontal

branchesonthelowertwofloors.Thereshallbenoconnectionstothestackbetweenthe

lowertwofloorsandadistanceofnotlessthan10pipediametersdownstreamfromthebase

ofthesinglestackventedsystem.

917.9Sizingbuildingdrainsandsewers.

Thebuildingdrainandbuildingsewerreceivingthedischargeofasinglestackventsystemshall

besizedinaccordancewithTable710.1(1).

SECTION918-AIRADMITTANCEVALVES

918.1General.

Ventsystemsutilizingairadmittancevalvesshallcomplywiththissection.Stack-typeair

admittancevalvesshallconformtoASSE1050.Individualandbranchtypeairadmittancevalves

shallconformtoASSE1051.

918.2Installation.

Thevalvesshallbeinstalledinaccordancewiththerequirementsofthissectionandthe

manufacturer'sinstructions.AiradmittancevalvesshallbeinstalledaftertheDWVtesting

requiredbySection312.2or312.3hasbeenperformed.

918.3Wherepermitted.

Individual,branchandcircuitventsshallbepermittedtoterminatewithaconnectiontoan

individualorbranch-typeairadmittancevalveinaccordancewithSection918.3.1.Stackvents

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andventstacksshallbepermittedtoterminatetostack-typeairadmittancevalvesin

accordancewithSection918.3.2.

918.3.1Horizontalbranches.

Individualandbranch-typeairadmittancevalvesshallventonlyfixturesthatareonthe

samefloorlevelandconnecttoahorizontalbranchdrain.Wherethehorizontalbranch

islocatedmorethanfourbranchintervalsfromthetopofthestack,thehorizontal

branchshallbeprovidedwithareliefventthatshallconnecttoaventstackorstack

vent,orextendoutdoorstotheopenair.Thereliefventshallconnecttothehorizontal

branchdrainbetweenthestackandthemostdownstreamfixturedrainconnectedto

thehorizontalbranchdrain.ThereliefventshallbesizedinaccordancewithSection

906.2andinstalledinaccordancewithSection905.Thereliefventshallbepermittedto

serveastheventforotherfixtures.

918.3.2Stack.

Stack-typeairadmittancevalvesshallbeprohibitedfromservingastheventterminal

forventstacksorstackventsthatservedrainagestackshavingmorethansixbranch

intervals.

918.4Location.

Individualandbranch-typeairadmittancevalvesshallbelocatedaminimumof4inches(102

mm)abovethehorizontalbranchdrainorfixturedrainbeingvented.Stack-typeairadmittance

valvesshallbelocatednotlessthan6inches(152mm)abovethefloodlevelrimofthehighest

fixturebeingvented.Theairadmittancevalveshallbelocatedwithinthemaximumdeveloped

lengthpermittedforthevent.Theairadmittancevalveshallbeinstallednotlessthan6inches

(152mm)aboveinsulationmaterials.

918.5Accessandventilation.

Accessshallbeprovidedtoallairadmittancevalves.Suchvalvesshallbeinstalledinalocation

thatallowsairtoenterthevalve.

918.6Size.

Theairadmittancevalveshallberatedinaccordancewiththestandardforthesizeofthevent

towhichthevalveisconnected.

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918.7Ventrequired.

Withineachplumbingsystem,notlessthanonestackventorventstackshallextendoutdoors

totheopenair.

918.8Prohibitedinstallations.

Airadmittancevalvesshallnotbeinstalledinnonneutralizedspecialwastesystemsas

describedinChapter8exceptwheresuchvalvesareincompliancewithASSE1049,are

constructedofmaterialsapprovedinaccordancewithSection702.5andaretestedfor

chemicalresistanceinaccordancewithASTMF1412.Airadmittancevalvesshallnotbelocated

inspacesutilizedassupplyorreturnairplenums.Airadmittancevalveswithoutanengineered

designshallnotbeutilizedtoventsumpsortanksofanytype.