Figure 61 1Other than Direct Vent Clearance - Ventilated Combustion Air Option
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D VENT TERMINAL qXi AIR SUPPLY INLET E_ AREA WHERE TERMINAL IS NOT PERMITED 25-24-55-2
NOTE:The followingis based uponNationalcodesfor gas appliances,and is provided as areference.
Refer to Local codes whichmay supersedethese standardsand/or recommendations.
ClearanceDescription
Clearanceabovegrade, veranda,porch, deck,balconyor
anticipatedsnowlevel 12 in. (305 ram)
4ft. (1.2M)below or tothe side ofthe opening,
Clearanceto awindow or doorthat maybe opened 1ft (.3M)abovethe opening.
Manufacturer'sRecommendation:See Note 8.
Clearanceto apermanently closedwindow
Verticalclearanceto aventilated soffit locatedabovethe
terminal withina horizontal distanceof 2feet (61 cm)from
thecentedine of the terminal
Clearanceto an unventilatedsoffit
Clearanceto an outsidecorner
Clearanceto an insidecorner
Clearanceto each side of the centerlineextended above
electricalmeteror gas serviceregulatorassembly
Clearanceto serviceregulatorvent outlet
Clearanceto non mechanicalair supplyinlet tobuilding or
the combustionair inlet to any otherappliance
Clearanceto a mechanicalair supplyinlet
Item
A
B
C
D
E
F
G
H
I
J
K
L
CanadianInstallations(1
(per CAN/CSAB149.1)
12in. (305 ram)
18 in. (457 ram)above roofsurface.
12 in. (305 ram)for appliances>10,000 Btuh (3kW)
and</=100,000Btuh ( 30 kW),
36 in. (914 ram)for appliances>100,000Btuh(30 kW)
U.S. Installationst2}
(perANSI Z223.1/NFPA54)
Forclearancesnot specifiedin ANSI Z223.1/NFPA54 or CAN/CSAB149.1,clearances shall be in accordancewith local
installationcodes andthe requirements of the gas supplierand the manufacturer'sinstallationinstructions.
Manufacturer'sRecommendation:See Notes3-8.
3 ft. (.9 M)within15 ft. (4.6 M) 3 ft. (.9 M)within15 ft. (4.6 M)
abovethe meter/regulatorassembly, abovethe meter/regulatorassembly.
3ft. (.9 M) See Note4.
12 in. (305 ram)for appliances>10,000Btuh(3 kW) 4ft. (1.2M)below or to the side ofthe opening,
and</= 100,000 Btuh ( 30 kW), 1ft (.3M) abovethe opening.
36 in. (914 ram)for appliances>100,000Btuh(30 kW) Manufacturer'sRecommendation:See Note 8
6 ft. (1.8 M) 3ft. (.9 M)
12in. (305 ram). See Note4.
Clearanceundera veranda,porch, deck,or balcony Permittedonly if veranda,porch, deck,or balcony isfully open
on a minimumof two sidesbeneath thefloor. Manufacturer'sRecommendation:See Notes 3-8.
Clearanceto eachside of the centedineextendedabove or
M below ventterminal of the furnaceto adryer or water heater 12in. (305 ram) 12in. (305 ram)
vent,or other appliance'sdirect vent intake or exhaust
Inletair clearanceto a moistureexhaust duct
N (dryervent, spa exhaust,etc.) 3 ft. (.9 M) 3 ft. (.9 M)
0 Clearancefrom a plumbingventstack 3 ft. (.9 M) 3 ft. (.9 M)
7ft. (2.1 M).
p Clearanceabovepavedsidewalk orpaved drivewaylocated Ventshall notterminateabove asidewalk or paveddriveway
on publicproperty that is locatedbetweentwo single-familydwellingsand serves 7ft. (2.1M)
bothdwellings.
> greaterthan,> greaterthanorequalto, < lessthan,< lessthanorequalto
Notes:
1.
2.
3.
In accordancewith the currentCAN/CSAB149.1,NaturalGas and PropaneInstallationCode.
In accordancewith the currentANSI Z223.1/NFPA54, NationalFuel GasCode
NOTE: Thistable is baseduponNationalcodesforgas appliances,andare providedas a reference.
Referto Loca/ codeswhich maysupersedethese standardsand/orrecommendations.
4. For clearancesnotspecifiedin ANSIZ223.1/NFPA54 or CAN/CSAB 149.1,clearancesshallbein accordancewithlocalinstallationcodesand the requirementsofthe
gas supplierandthe manufacturer'sinstallationinstructions.
5. Whenlocatingventterminations,considerationmustbegivento prevailingwinds,location,andother conditionswhich maycauserecirculationof the combustionproducts
of adjacentvents.Recirculationcancause poorcombustion,inlet condensationproblems,and/or acceleratedcorrosionof the heat exchangers.
6. Designand positionvent outletsto avoidicebuild-up on and moisturedamageto surroundingsurfaces.
7. Thevent forthisapplianceshall not terminate:
a. Nearsoffitvents of crawlspace vents or otherareaswherecondensateor vapor could createa nuisanceor hazardor propertydamage;or
b. Where condensatevapor could causedamageor couldbe detrimentalto the operationof regulators,reliefvalves,or otherequipment.
8. These Nationalstandardsapplyto all non-direct-ventgasappliances.ContactLocalcodeofficialsfor additionalrequirementsand!orexclusions.
54 Specifications subject to change without notice. 440 O1 4OO1 04
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