44
Venting
INSTALLATION INSTRUCTIONS
Vertical Vent Terminal Location
A, B
12" Min.
(300 mm)
Vent Pipe
Through Roof
Optional
The followingchartwithdiagramsdetailstheminimumdimensionalinformationneededtodeterminetheproper
locationoftheverticalventterminalfordirect-ventindoortanklesswaterheaters:
Location
U.S.Installation
Requirements
1
CanadianInstallation
Requirements
2
A=Minimumclearanceabovetheroof
level.
12in.(30.5cm)aboverooflevel.
18in.(45.7cm)aboverooflevel.
B=Maximumclearanceaboveroof
level(withoutadditionalsupportfor
ventpipe).
24in.(61cm)aboverooflevel.
24in.(61cm)aboverooflevel.
C=Requiredventclearancefromany
gable,dormer,orotherroofstruc-
turewithbuildinginterioraccess
(i.e.,vent,window).
4ft.(1.2m)
4ft.(1.2m)
D=Requiredventclearancefromany
forcedairinlet,includingdryerand
furnaceairinlets.
10ft.(3m)
6ft.(1.8m)
E=Minimum/maximumhorizontaldis-
tancebetweenventterminals
5.5in.(14cm)/24in.(61cm)
5.5in.(14cm)/24in.(61cm)
1 InaccordancewithcurrentANSIZ223.1/NFPA54NationalFuelGasCode.
2InaccordancewithcurrentCAN/CSAB149.1InstallationCodes.
The verticalintakeairterminationrequiresareturn
bend ortwoshortorlongsweepradius90°elbows
tokeeptheinletdownwardandprevententryof
rain.Refertofigureabovefortheproperlocation
oftheairintakewithrespecttotheexhaustoutlet
termination.Theverticalexhaustoutlettermination
isa2-inchor3-inchpipewhichterminatesatleast12
inches(30.5cm)abovetheairintaketermination.The
exhaustoutletterminationsmustbeatleast18inches
(45.7cm)(12inches(30.5cm)inUS)abovetheroofline
oranticipatedsnowlevels.
VentingforDirect-VentWaterHeater(cont.)