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VENT
TERMINAL
\\
_
AIR SUPPLY
INLET
E_
AREA WHERE
TERMINAL
IS NOT PERMITED
NOTE:
The
following
is based
upon
National
codes
for gas
appliances
and
is provided
as a reference.
Refer
to local
codes
which
may
supersede
these
standards
and/or
recommendations.
U.S. Installationstz
Clearance Description
(per ANSI Z223.1/NFPA 54)
Item
A
Clearanceabove grade, veranda, porch, deck, balconyor
anticipated snow level
B
Clearanceto a window or doorthat may be opened
C
Clearanceto a permanentlyclosed window
Vertical clearanceto a ventilatedsoffit located above the
D
terminal within a horizontal distance of 2 feet (61 cm) from
the centerlineof the terminal
E
Clearanceto an unventilated soffit
F
Clearanceto an outside corner
G
Clearanceto an inside corner
Clearanceto each side of the centerline extendedabove
H
electricalmeter or gas serviceregulator assembly
I
Clearanceto service regulatorvent outlet
Clearance to non--mechanical air supply inlet to buildingor
J
the combustionair inlet to any other appliance
K
Clearanceto a mechanical air supply inlet
L
Clearanceunder a veranda, porch, deck, or balcony
Clearanceto each side of the centedineextended above or
M
belowvent terminal of the furnace to a dryeror water heater
vent, or other appliance'sdirect vent intake or exhaust
Inlet air clearance to a moistureexhaust duct
N
(dryervent, spa exhaust,etc.)
O
Clearancefrom a plumbingvent stack
p
Clearance above paved sidewalk or paved drivewaylocated
on publicproperty
> greater than, _>greater than or equalto, < less than, _<less than or equal to
Notes:
1
2
12 in. (305 mm)
4ft. (1.2M) below or to the side of the opening,
1 ft (.3M) above the opening.
Manufacturer'sRecommendation:See Note 8.
A12325
For clearances not specifiedin ANSI Z223.1/NFPA54, clearancesshall be in accordancewith local installationcodes
and the requirementsof the gas supplier and the manufacturer'sinstallationinstructions.
Manufacturer'sRecommendation:See Notes3-8.
3 ft. (.9 M) within 15 ft. (4.6 M)
above the meter/regulatorassembly.
See Note 4.
4ft. (1.2M) below or to the side of the opening,
1 ft (.3M) above the opening.
Manufacturer'sRecommendation: S ee Note8
3ft. (.9 M)
See Note 4.
Manufacturer'sRecommendation:See Notes3-8.
12 in. (305 mm)
12 in. (305 mm) See Note 4
3 ft. (.9 M)
7ft. (2.1M)
In accordancewith the currentANSI Z223.1/NFPA 54, NationalFuel GasCode
NOTE: Thistableis based upon Nationalcodes forgas appliances,andare providedas a reference.
Refer to Local codes which may supersedethese standardsand/orrecommendations.
3
Forclearancesnotspecifiedin ANSIZ223.1/N FPA54,clearancesshallbe inaccordancewith localinstallationcodesandthe requirements of the gas supplierand
the manufacturer'sinstallationinstructions.
4
When locatingvent terminations,consideration must begivento prevailingwinds, location,andother conditionswhichmay causerecirculationof the combustion
productsof adjacentvents.Recirculation can cause poorcombustion,inletcondensation problems,vent terminationicing, and/oracceleratedcorrosionof theheat
exchangers.
5
Designand positionvent outletsto avoidice build-upon and moisturedamageto surroundingsurfaces.
6
The vent for this applianceshall not terminate:
a. Near soffit vents of crawl spacevents or other areaswhere condensateor vaporcould create a nuisance or hazardor propertydamage;or
b. Where condensatevapor could causedamage or could be detrimentalto the operationof regulators,relief valves, or other equipment.
7
These Nationalstandardsapplyto all non-direct-ventgas appliances.Contact Localcode officialsfor additionalrequirementsand/or exclusions.
Fig. 47 - Ventilated
Combustion
Air and Non-Direct
Vent Termination
Clearance
52
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