38
INSTALLATION INSTRUCTIONS
VentingforDirect-VentWaterHeater(cont.)
Location
U.S.Installation
Requirements
1
CanadianInstallation
Requirements
2
A=Clearanceabovegrade,veranda,
porch,deck,orbalcony.
12in.(30cm)
12in.(30cm)
B=Clearancetowindowordoorthatmay
beopened.
•
6in.(15cm)forwaterheaterslessthanor
equalto10,000Btuh(3kW).
•
9in.(23cm)forwaterheatersgreaterthan
10,000Btuh(3kW)andlessthanorequalto
50,000Btuh(15kW).
•
12in.(30cm)forwaterheatersgreaterthan
50,000Btuh(15kW).
•
6in.(15cm)forwaterheaterslessthanor
equalto10,000Btuh(3kW).
•
12in.(30cm)forwaterheatersgreaterthan
10,000Btuh(3kW)andlessthanorequalto
100,000Btuh(30kW).
•
36in.(91cm)forwaterheatersgreaterthan
100,000Btuh(30kW).
C=Clearancetopermanentlyclosed
window.
D=Verticalclearancetoventilatedsoffit
locatedabovetheterminalwithina
horizontaldistanceof2ft.(61cm)
fromthecenterlineoftheterminal.
E=Clearancetounventilatedsoffit.
F=Clearancetooutsidecorner.
G=Clearancetoinsidecorner.
H=Clearancetoeachsideofcenterline
extendedabovemeter/regulator
assembly.
3ft.(91cm)withinaheightof15ft.(4,57m)
abovethemeter/regulatorassembly.
I=Clearancetoserviceregulatorvent
outlet.
3ft.(91cm)
J=Clearancetononmechanicalairsupply
inlettothecombustionairinlettoany
buildingorotherappliance.
•
6in.(15cm)forwaterheaterslessthanor
equalto10,000Btuh(3kW).
•
9in.(23cm)forwaterheatersgreaterthan
10,000Btuh(3kW)andlessthanorequalto
50,000Btuh(15kW).
•
12in.(30cm)forwaterheatersgreaterthan
50,000Btuh(15kW).
•
6in.(15cm)forwaterheaterslessthanor
equalto10,000Btuh(3kW).
•
12in.(30cm)forwaterheatersgreaterthan
10,000Btuh(3kW)andlessthanorequalto
100,000Btuh(30kW).
•
36in.(91cm)forwaterheatersgreaterthan
100,000Btuh(30kW).
K=Clearancetomechanicalairsupply
inlet.
3ft.(91cm)aboveifwithin10ft.(3m)
horizontally.
6ft.(1,83m)
L=Clearanceabovepavedsidewalkor
paveddrivewaylocatedonpublic
property.
7ft.(2,13m)
†
M=Clearanceunderveranda,porch,deck,
orbalcony.
12in.(30cm)
‡
1 InaccordancewithcurrentANSIZ223.1/NFPA54NationalFuelGasCode.
2InaccordancewithcurrentCAN/CSAB149.1InstallationCodes.
ForclearancesnotspecifiedinANSIZ223.1/NFPA54orCAN/CSAB149.1,oneofthefollowingshallbeindicated:
a) Aminimumclearancevaluedeterminedbytestinginaccordancewithsection2.20,or
b) Areferencetothefollowingfootnote:“Clearanceinaccordancewithlocalinstallationcodesandtherequirementsofthegassupplier.”
†Aventshallnotterminatedirectlyaboveasidewalkorpaveddrivewaythatislocatedbetweentwosingle-familydwellingsandservesboth
dwellings.
‡Permittedonlyifveranda,porch,deck,orbalconyisfullyopenonaminimumoftwosidesbeneaththefloor.
The followingchartdetailstheminimaldimensionalinformationneededtodeterminetheproperlocationofthevent
terminalfordirectventandoutdoortanklesswaterheaters.Seecorrespondingletterreferenceintheillustrationat
left.
Venting