SECTION 11: V
ENTING
- G
ENERAL
53 of 91
SECTION 11: VENTING - GENERAL
11.1 General Venting Re
q
uirements
This heater m
u
st be vented in accordance
w
ith the
r
u
les contained in this man
u
al and
w
ith the follo
w
ing
national codes and any state, provincial or local
codes
w
hich may apply:
United States:
Refer to National F
u
el Gas Code
NFPA 54/ANSI Z223.1 - latest revision.
Canada:
Refer to Nat
u
ral Gas and Propane
Installation Code CSA B149.1 - latest revision.
Any portion of vent pipe passing thro
u
gh a
comb
u
stible
w
all m
u
st have an approved thimble to
conform
w
ith the above listed codes.
Vent pipe m
u
st be sloped do
w
n
w
ard a
w
ay from the
heater 1/2'' (1 cm) for every 20' (6 m).
The bottom of the vent or air intake terminal shall not
be located less than 1' (0.3 m) above grade level.
The vent shall not terminate less than 7' (2.1 m)
above grade
w
here located adjacent to p
u
blic
w
alk
w
ays.
Vent terminal m
u
st be installed at a height s
u
fficient
to prevent blockage by sno
w
and b
u
ilding materials
protected from degradation by fl
u
e gases.
Sec
u
re all joints
w
ith #8 x 3/8 sheet metal scre
w
s.
Seal all joints
w
ith high temperat
u
re silicone sealant.
Vent terminal m
u
st be beyond any comb
u
stible
overhang.
For vertical venting, vent shall not extend less than 2'
(0.6 m) above the highest point
w
here it passes
thro
u
gh a flat roof of a b
u
ilding.
11.1.1 United States Re
q
uirements
Vent m
u
st terminate at least 3' (0.9 m) above any
forced air inlet located
w
ithin 10' (3.1 m).
Vent m
u
st terminate at least 4' (1.2 m) belo
w
,
4' (1.2 m) horizontally from, or 1' (0.3 m) above any
door, operable
w
indo
w
, or gravity air inlet into any
b
u
ilding.
11.1.2 Canadian Re
q
uirements
The vent shall not terminate
w
ithin 6' (1.8 m) of a
mechanical air s
u
pply inlet to any b
u
ilding.
The vent shall not terminate
w
ithin 3' (0.9 m) of a
w
indo
w
or door that can be opened in any b
u
ilding,
any non-mechanical air s
u
pply inlet to any b
u
ilding,
or of the comb
u
stion air inlet of any other appliance.
WARNING
Carbon Monoxide Hazard
Multiburner systems are not approved for
unvented use and must be vented outdoors.
Unitary heaters installed unvented must be
interlocked with sufficient buildin
g
exhaust.
Heaters must be installed accordin
g
to the
installation manual.
Failure to follow these instructions can result
in death or injury.
WARNING
Cut/Pinch Hazard
Wear protective
g
ear durin
g
installation,
operation and service.
Ed
g
es are sharp.
Failure to follow these instructions can result
in injury.
