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VENT TERMINAL
(_AIR
SUPPLY
INLET
E_
AREA WHERE
TERMINAL
IS NOT PERMITED
item
Clearance Description
Canadian
installation
(I)
U.S Installation (2)
A
Clearance above grade, veranda,
porch, deck, balcony, or
12" (30cm) #
12" (30 cm)
anticipated
snow level
B
Clearance to a window or door that may be opened
6"(15crn)forappliances<10,OOOBTUH(3kW),12"(30
6" (15 crn) for appliances
< 10,600 BTUH (3kW), 9" (23 cm)
cm) for appliances
> 16,000 Btuh (3 kW) and <100,600 Btuh
for appliances
> 10.0O0 Btuh (3 kW) and < 50,000 Btuh (15
(30 kW), 36" (91 cm) for appliances
> 160,000 Btuh (30 kW)
kW), 12" (30 cm) for appliances
> 56,006 Btuh (15 kW)
C
Clearance to a permanently
closed window
D
Vetfical clearance
to a ventilated
soffit located above the
terminal within a horizontal
distance of 2"(61 cm) from the
centerline
of the terminal
E
Clearance to an unventilated
soffit
P
Clearance to an outside corner
G
Clearance to an inside corner
H
Clearance to each side of the centedine
extended above
3" (91 cm) within 15 (4.5 m) above the meter/regulator
3" (91 cm) within 15"(45
m) above the meter/regulator
electrical
meter or gas service regulator assembly
assembly
assembly
I
Clearance to service regulator
vent outlet
3" (91 cm)
J
Clearance to non-mechanical
air supply inlet to building or
6" (15 ore) for appliances
< 10,OOOBTUH (3kW), 9" (23 ore)
6" (t 5 ore) for appliances
< 10,OOOBTUH (3kW), 9" (23 ore)
the combustion
air inlet to any other appliance
for appliances
> 10.0O0 Btuh (3 kW) and < t 06,000 Btuh (30
for appliances
> 10.0O0 Btuh (3 kW) and < 50,000 Btuh (15
kW)and
< 50,000 Btuh (15kW),
12"(30cm)
forappliances
kW), 12" (30cm)for
appliances
> 50,060 Btuh (15 kW)
> 50,000 Btuh (I5 kW)
K
Clearance to a mechanical
air supply inlet
6" (1.83 m)
3" (91 cm) above if within 10'(3m horizontally)
L
Clearance under a veranda, porch, deck. or balcony
12" (30 cm) +
M
Clearance to each side of the centedine
extended above or
12" (30 cm)
12" (30 cm)
below vent terminat of the furnace
to a dryer or water heater
vent, or other appliances
direct vent intake or exhaust
N
Clearance to the vent terminal of a dryer vent, water heater
3" (91 cm)
3" (91 cm)
vent. or other appliances
direct vent intake or exhaust.
O
Clearance from a plumbing
vent stack
3" (91 cm)
3" (91 cm)
(1)
In accordance with the current CSA B 149 1, Natural Gas and Propane Installafion
Code
(2)
In accordance with the current ANSl Z223.1/NFPA
54. Nafional Fuel Gas Code
#
18"
(46cm)aboveroofsurface
+
Permitted
only if veranda, porch, deck, or balcony is fully open on a minimum of t_vo sides beneath the floor
For clearances
not specified
in ANSi Z223.1/N PPA 54 or CSA B 149.1, clearances
shall be in accordance
with local installation
codes and the requirements
of the gas supplier
and the
manufactureCs
installation
instructions
Notes:
1.
The vent for this appliance
shall not terminate
a
Over public walkways;
or
b. Near soffit vents or crawl space vents or other areas where condensate
or vapor could create a nusiance or hazard or property
damage; or
c
Where condensate
vapor could cause damage or could be detrimental
to the operafion of regulators,
relief valves, or other equiprnent.
2.
When Iocafing vent terminations,
consideration
must be given to prevailing winds, location, and other conditions
which may cause recirculation
of the combusfiob
products of adjacent vents
Recirculafion
can cause poor combustion,
inlet condensate
problems,
and accelerated
corrosion
of the heat exchangers.
A03227
Table 5--Direct
Vent Termination
Clearance
26
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