Termination Clearances Sidewall Direct Vent - A.O. Smith BTH-120 Instruction Manual

termination clearances sidewall direct Vent

D
E
v
L
V
Vent terminal clearances for "Direct Vent" installations. Direct Vent configurations use outdoor air for combustion.
canadian installations
Clearance above grade,
a
veranda, porch, deck or 12 inches (30 cm)
balcony
6 inches (15 cm) for appliances
up to 10,000 Btu/hr (3 kW), 12
inches (30 cm) for appliances
Clearance to window or
B
between 10,000 Btu/hr (3 kW)
door that may be opened
and 100,000 Btu/hr (30 kW), 36
inches (91 cm) for appliances
above 100,000 Btu/hr (30 kW)
Clearance to
c
permanently closed 6 inches (15 cm)*
window
Vertical clearance to
ventilated soffit located
above the terminal within
d
12 inches (30 cm)*
a horizontal distance of
2 feet (61 cm) from the
center line of the terminal
Clearance to unventilated
e
12 inches (30 cm)*
soffit
Clearance to outside
f
2 feet (60 cm)*
corner
Clearance to inside
g
18 inches (45 cm)*
corner
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.
Where it may cause hazardous frost or ice accumulations on adjacent property surfaces.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer's installation instructions.
(using outdoor air for combustion)
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION
B
v
C
F IX E D
V
C L O S E D
O P E R A B L
V
F
B
X
VENT TERMINAL AIR SUPPLY INLET
1
us installations
12 inches (30 cm)
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)
6 inches (15 cm)*
12 inches (30 cm)*
12 inches (30 cm)*
2 feet (60 cm)*
18 inches (45 cm)*
DIRECT VENT
G
V
A
B
B
V
F IX E D
C L O S E D
O P E R A B L E
V
X
E
B
V
B
J
A
AREA WHERE TERMINAL IS NOT PERMITTED
figure 49
2
Clearance to each side
of center line extended
h
above meter/regulator
assembly
Clearance to service
i
regulator vent outlet
Clearance to a non
mechanical air supply
j
inlet into building or
combustion air inlet to
any other appliance
Clearance to a
k
mechanical air supply
inlet
Clearance above
paved sidewalk or
l
paved driveway located
on public property
Clearance under
m
veranda, porch, deck,
or balcony
37
H
M
X
V
K
1
canadian installations
3 feet (91 cm) within a height 15 3 feet (91 cm) within a height
feet (4.5 m) above the meter/ 15 feet (4.5 m) above the
regulator assembly meter/regulator assembly*
3 feet (91 cm) 3 feet (91 cm)*
6 inches (15 cm) for
6 inches (15 cm) for appliances up
appliances up to 10,000
to 10,000 Btu/hr (3 kW), 12 inches
Btu/hr (3 kW), 9 inches (23
(30 cm) for appliances between
cm) for appliances between
10,000 Btu/hr (3 kW) and 100,000
10,000 Btu/hr (3 kW) and
Btu/hr (30 kW), 36 inches (91 cm)
50,000 Btu/hr (15 kW), 12
for appliances above 100,000 Btu/
inches (30 cm) for appliances
hr (30 kW)
above 50,000 Btu/hr (15 kW)
3 feet (91 cm) above if within
6 feet (1.83 m)
10 feet (3 m) horizontally
7 feet (2.13 m)† 7 feet (2.13 m)†*
12 inches (30 cm) ‡ 12 inches (30 cm) ‡*
2
us installations