Venting - All Models - Single Pipe Direct Vent - Using Outside Air Termination Clearances Sidewall Power Vent - A.O. Smith BTH 120 Series Service Handbook

VENTING – ALL MODELS – SINGLE PIPE DIRECT VENT – USING OUTSIDE AIR
TERMINATION CLEARANCES SIDEWALL POWER VENT
D
E
v
L
v
V
VENT TERMINAL
Vent terminal clearances for "Power Vent" installations. Power Vent configurations use room 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
Clearance to window
cm) for appliances between 10,000
B
or door that may be
Btu/hr (3 kW) and 100,000 Btu/hr (30
opened
kW), 36 inches (91 cm) for appliances
above 100,000 Btu/hr (30 kW)
Clearance to
C
permanently closed 12 inches (30 cm)*
window
Vertical clearance to
ventilated soffit located
above the terminal
D
within a horizontal 12 inches (30 cm)*
distance of 2 feet (61
cm) from the center line
of the terminal
Clearance to
E
12 inches (30 cm)*
unventilated soffit
Clearance to outside
F
2 feet (60 cm)*
corner
Clearance to inside
G
8 feet (2.44 m)*
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.
‡ 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.
14
(using room air for combustion)
EXTERIOR CLEARANCES FOR SIDEWALL VENT TERMINATION
B
C
F IX E D
V
C LO S E D
O P E R A B LE
V
F
B
X
AIR SUPPLY INLET
1
US INSTALLATIONS
12 inches (30 cm)
4 feet (1.2 m) below
or to side of opening;
1 foot (30 cm) above
opening
12 inches (30 cm)*
12 inches (30 cm)*
12 inches (30 cm)*
2 feet (60 cm)*
8 feet (2.44 m)*
Servicing should only be performed by a Qualified Service Technician
POWER VENT
G
V
A
B
B
V
F IX E D
C LO S E D
O P E R A B LE
V
X
B
V
B
J
A
AREA WHERE TERMINAL IS NOT PERMITTED
Figure 1
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 paved
L
driveway located on
public property
Clearance under
M
veranda, porch, deck, or
balcony
H
M
X
V
K
1
CANADIAN INSTALLATIONS
3 feet (91 cm) within a height 15 feet
(4.5 m) above the meter/
regulator assembly
3 feet (91 cm)
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 (30kW), 36 inches (91cm)
for appliances above 100,000 Btu/
hr (30 kW)
6 feet (1.83 m)
7 feet (2.13 m)†
12 inches (30 cm) ‡
2
US INSTALLATIONS
3 feet (91 cm) within a
height 15 feet (4.5 m)
above the meter/regulator
assembly*
3 feet (91 cm)*
4 feet (1.2 m) below or to
side of opening; 1 foot
(30 cm) above opening.
3 feet (91 cm) above if
within
10 feet (3 m) horizontally
7 feet (2.13 m)
12 inches (30 cm) ‡