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32
TERMINATION CLEARANCES SIDEWALL DIRECT VENT
FIGURE 32. DIRECT VENT
Vent terminal clearances for “Direct Vent” installations. Direct Vent congurations use outdoor air for combustion.
CANADIAN INSTALLATIONS
1
US INSTALLATIONS
2
CANADIAN INSTALLATIONS
1
US INSTALLATIONS
2
A
Clearance above grade,
veranda, porch, deck or
balcony
12 inches (30 cm) 12 inches (30 cm)
H
Clearance to each side
of center line extended
above meter/regulator
assembly
3 feet (91 cm) within a height 15
feet (4.5 m) above the meter/
regulator assembly
3 feet (91 cm) within a height
15 feet (4.5 m) above the
meter/regulator assembly*
B
Clearance to window or
door that may be opened
6 inches (15 cm) for appliances
up to 10,000 Btu/hr (3 kW), 12
inches (30 cm) for appliances
between 10,000 Btu/hr (3 kW)
and 100,000 Btu/hr (30 kW), 36
inches (91 cm) for appliances
above 100,000 Btu/hr (30 kW)
6 inches (15 cm)
for appliances up to
10,000 Btu/hr (3 kW),
9 inches (23 cm) for
appliances between
10,000 Btu/hr (3 kW)
and 50,000 Btu/hr (15
kW), 12 inches (30 cm)
for appliances above
50,000 Btu/hr (15 kW)
I
Clearance to service
regulator vent outlet
3 feet (91 cm) 3 feet (91 cm)*
C
Clearance to
permanently closed
window
6 inches (15 cm)* 6 inches (15 cm)*
J
Clearance to a non
mechanical air supply
inlet into building or
combustion air inlet to
any other appliance
6 inches (15 cm) for appliances up
to 10,000 Btu/hr (3 kW), 12 inches
(30 cm) for appliances between
10,000 Btu/hr (3 kW) and 100,000
Btu/hr (30 kW), 36 inches (91 cm)
for appliances above 100,000 Btu/
hr (30 kW)
6 inches (15 cm) for
appliances up to 10,000
Btu/hr (3 kW), 9 inches (23
cm) for appliances between
10,000 Btu/hr (3 kW) and
50,000 Btu/hr (15 kW), 12
inches (30 cm) for appliances
above 50,000 Btu/hr (15 kW)
D
Vertical clearance to
ventilated soft located
above the terminal within
a horizontal distance of
2 feet (61 cm) from the
center line of the terminal
12 inches (30 cm)* 12 inches (30 cm)*
K
Clearance to a
mechanical air supply
inlet
6 feet (1.83 m)
3 feet (91 cm) above if within
10 feet (3 m) horizontally
E
Clearance to unventilated
soft
12 inches (30 cm)* 12 inches (30 cm)*
L
Clearance above
paved sidewalk or
paved driveway located
on public property
7 feet (2.13 m)† 7 feet (2.13 m)†*
F
Clearance to outside
corner
2 feet (60 cm)* 2 feet (60 cm)*
M
Clearance under
veranda, porch, deck,
or balcony
12 inches (30 cm) ‡ 12 inches (30 cm) ‡*
G
Clearance to inside
corner
8 feet (2.44 m)* 8 feet (2.44 m)*
1 In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the oor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation instructions.
V X
VENT TERMINAL AIR SUPPLY INLETAREA WHERE TERMINAL IS NOT PERMITTED
v
v
A
G
V
FIXED
CLOSED
FIXED
CLOSED
OPERABLE
OPERABLE
V
C
B
B
B
B
F
B
V
V
A
J
V
H
M
X
X
V
V
K
B
E
D
L
DIRECT VENT
(using outdoor air for combustion)
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION