USE ONLY GENUINE REPLACEMENT PARTS 19
Table9b Positive-Pressure (CATIII) Vent Termination Clearances
Canadian Installation (2)
Clearance above grade, veranda, porch, deck,
balcony or anticipated snow level
12 in. (305 mm). 18 in. (457 mm) above roof surface.
Clearance to a window or door that may be opened
12 in. (305 mm)
f
o
r
appliances
>
500,000 Btuh (15
kW)
36 in. (914 mm)
f
o
r
appliances
>
100,000 Btuh (30
kW)
Clearance to a permanently closed window
For clearances not specified in ANSI
Z223.1/NFPA
54 o
r
C A N / CSA B149.1, clearances shall be in
a
cc
o
r
d
a
n
c
e
with local installation codes and the requirements o
f
the gas supplier
For clearances not specified in ANSI
Z223.1/NFPA
54 o
r
C A N / CSA B149.1, clearances shall be in
a
cc
o
r
d
a
n
c
e
with local installation codes and the requirements of
the gas supplier
Vertical clearance to a ventilated soffit located
above the terminal within a horizontal distance of 2
feet (61 cm) from the centerline of the terminal
Clearance to an unventilated soffit
Clearance to an outside corner
Clearance to an inside corner
Clearance to each side of the centerline extended
above electrical meter or gas service regulator as-
sembly
3 ft. (.9 M) within 15 ft. (4.6 M) above the m
e
t
er
/
regulator
asse
m
b
ly
3 ft. (.9 M) within 15 ft. (4.6 M) above the m
e
t
er
/
regulator assembly
Clearance to service regulator vent outlet
For clearances not specified in ANSI
Z223.1/NFPA
54 o
r
C A N / CSA B149.1, clearances shall be in
a
cc
o
r
d
a
n
c
e
with local installation codes and the requirements of
the gas supplier
Clearance to non ---mechanical air supply inlet to
building or the combustion air inlet to any other
appliance
9 in. (229 mm) for appliances > 10,000 Btuh (3kW) and <=
50,000 Btuh (15 kW), 12 in. (305 mm) for appliances >
50,000 Btuh (15 kW)
12 in. (305 mm) for appliances
>
10,000 Btuh(3kW)
and
<
=
100,000 Btuh (30 kW), 36 in. (914 mm)
f
o
r
appliances
>
100,000 Btuh (30 kW)
Clearance to a mechanical air supply inl
et
Clearance above paved sidewalk or paved driveway
located on public
p
r
o
p
er
ty
For clearances not specified in ANSI
Z223.1/NFPA
54 o
r
CAN/CSA B149.1, clearances shall be in
a
cc
o
r
d
a
n
c
e
with local installation codes and the requirements o
f
the gas supplier
7 ft. (2.1 M). A vent shall not terminate above a side-
walk or paved driveway that is located between two
single family dwellings and serves both
d
wellin
g
s.
Clearance under a veranda, porch, deck, or
b
a
lcony
For clearances not specified in ANSI
Z223.1/NFPA
54 o
r
C A N / CSA B149.1, clearances shall be in
a
cc
o
r
d
a
n
c
e
with local installation codes and the requirements o
f
the gas supplier
12 in. (305 mm). Permitted only if veranda,
p
o
r
c
h
,
deck, or balcony is fully open on a minimum of two
sides beneath the
f
loo
r.
Clearance from a plumbing vent
s
t
a
c
k
(1) In accordance with the current ANSI Z223.1.NFPA 54, National Fuel Gas Code
(2) In accordance with the current C A N / CSA B 149.1, Natural Gas and Propane Installation Code.
WARNING:
1. The vent for this appliance shall not terminate:. Over public walkways; or Near soffit vents of crawl space vents or other areas where condensate or
vapor could create a nuisance or hazard or property damage; or Where condensate vapor could cause damage or could be detrimental to the operation of
regulators, relief valves, or other equipment.
2. When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of
the combustion products of adjacent vents. Recirculation can cause poor combustion, inlet condensate problems, and accelerated corrosion of the heat
exchangers.
3. Do not vent under a deck or large overhang. Recirculation could occur and cause performance or system problems.
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