Sidewall Termination Direct Vent Clearances - A.O. Smith 300 Series Instruction Manual

SIDEWALL TERMINATION DIRECT VENT CLEARANCES

D
E
V
B
L
V
Legend:
V
= Vent terminal
Vent terminal clearances for "Power Vent" installations. Power Vent configurations use room air for combustion.
Termination Clearances for Sidewall Direct Vent
Type of Clearance
Canadian Installations
Clearance above grade, ve-
A
12 inches (30 cm)
randa, porch, deck or balcony
6 in (15 cm) for appliances ≤
B •
10,000 Btuh (3 kW)
12 in (30 cm) for appliances
•
Clearance to window or door
> 10,000 Btuh (3 kW) and ≤
that may be opened
100,000 Btuh (30 kW),
36 in (91 cm) for appliances
•
> 100,000 Btuh (30 kW)
Clearance to permanently
C
6 inches (15 cm)*
closed window
Vertical clearance to ventilated
D
soffit located above the termi-
nal within a horizontal distance 12 inches (30 cm)
of 2 feet (61 cm) from the
center line of the terminal
Clearance to unventilated soffit 12 inches (30 cm)
E
Clearance to outside corner 2 feet (60 cm)*
F
Clearance to inside corner 18 inches (45 cm)*
G
Clearance to each side of
H
3 ft (91 cm) within a height 15 ft
center line extended above
(4.6 m)
meter/regulator assembly
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
Inside
corner detail
V
A
C
Fixed
V
Closed
Operable
V
F
B
X
= Air supply inlet
Figure 24. Direct Vent Using Outside Air
2
1
US Installations
12 inches (30 cm)
4 feet (1.2 m) below or to
•
side of opening;
1 foot (30 cm) above opening
•
6 inches (15 cm)*
12 inches (30 cm)
12 inches (30 cm)
2 feet (60 cm)*
18 inches (45 cm)*
Clearance in accordance with local
installation codes and the require-
ments of the gas supplier
G
B
B
V
Fixed
closed
Operable
V
B
X
V
B
J
A
= Area where terminal is not permitted
Termination Clearances for Sidewall Direct Vent
Type of Clearance
I
Clearance to service regulator
vent outlet
J
Clearance to a non mechanical
air supply inlet into building
or combustion air inlet to any
other appliance
Clearance to a mechanical air
K
supply inlet
L
Clearance above paved
sidewalk or paved driveway
located on public property
Clearance under veranda,
M
porch, deck, or balcony
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.
28
H
15 ft
M
V
I
Regulator vent outlet
In the event no
regulator is present,
H and I can be
.
disregarded
1
Canadian Installations
Clearance in accordance with local
3 ft (1.83 m) installation codes and the require-
ments of the gas supplier
6 in (15 cm) for appliances ≤
•
10,000 Btuh (3 kW)
12 in (30 cm) for appliances 4 feet (1.2 m) below or to
• •
> 10,000 Btuh (3 kW) and ≤ side of opening;
100,000 Btuh (30 kW) 1 foot (30 cm) above opening
•
36 in (91 cm) for appliances
•
>100,000 Btuh (30 kW)
3 feet (91 cm) above if within 10
6 feet (1.83 m)
feet (3 m) horizontally
7 ft (2.13 m) for mechanical draft
systems (Category I appliances);
vents for Category II and IV ap-
7 feet (2.13 m)† pliances cannot be located above
public walkways or other areas
where condensate or vapor can
cause a nuisance or hazard
12 inches (30 cm) ‡ 12 inches (30 cm) ‡
X
K
2
US Installations