16
Figure 10
Installation
Regulator vent outlet in the event no
regulator is present, H and I can be
disregarded.
Fixed
closed
15 ft
Fixed
closed
Inside
corner detail
Operable
Operable
Horizontal Vent Terminal Location for Power Vent
The following information should be used for determining the proper location of the vent terminal for
direct vent water heaters.
V
VENT TERMINAL
X
AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITTED
Canadian Installations
1
US Installations
2
1 In accordance with current CAN/CSA-B149.1 Installation Codes.
2 In accordance with 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.
* "Clearance in accordance with local installation codes and the requirements of the gas supplier."
A= Clearance above grade, veranda, porch, deck
or balcony.
12 inches (30 cm) 12 inches (30 cm)
B= Clearance to window or door that may be
opened.
• 6 in (15 cm) for appliances ≤ 10,000 Btuh
(3 kW),
• 12 in (30 cm) for appliances > 10,000 Btuh
(3 kW) and ≤ 100,000 Btuh (30 kW),
• 36 in (91 cm) for appliances > 100,000 Btuh
(30 kW)
4 feet (1.2 m) below or to side of opening; 1 foot
(300 mm) above opening.
C= Clearance to permanently closed window.
0 in (0 cm) 0 in (0 cm)
D= Vertical Clearance to ventilated soffit located
above the terminal within a horizontal dis-
tance of 2 feet (61 cm) from the center line of
the terminal.
12 in (30 cm) 12 in (30 cm)
E= Clearance to unventilated soffit. 12 in (30 cm) 12 in (30 cm)
F= Clearance to outside corner. 24 in (61 cm) 24 in (61 cm)
G= Clearance to inside corner. 18 in (46 cm) 18 in (46 cm)
H = Clearance to each side of center line extend-
ed meter/regulator assembly. above
3 feet (91 cm) within a height 15 feet (4.6 m) 3 ft (91 cm) within a height of 15 ft (4.6 m)
I = Clearance to service regulator vent outlet. 3 feet (91 cm) 3 feet (91 cm)
J = Clearance to nonmechanical air supply inlet
to building or the combustion air inlet to any
other appliance..
• 6 in (15 cm) for appliances ≤ 10,000 Btuh
(3 kW),
• 12 in (30 cm) for appliances > 10,000 Btuh
(3 kW) and ≤ 100,000 Btuh (30 kW),
• 36 in (91 cm) for appliances > 100,000 Btuh
(30 kW)
4 feet (1.2 m) below or to side of opening; 1 foot
(300 mm) above opening.
K = Clearance to mechanical air supply inlet.
6 feet (1.83 m)
3 feet (91 cm) above if within 10 feet (3 m) hori-
zontally.
L = Clearance above paved side walk or paved
driveway located on public property.
7 feet (2.13 m) 7 feet (2.13 m)
M = Clearance under veranda, porch, deck or
balcony.
12 in ( 30 cm)+ 12 in ( 30 cm)+
To Next Page
Loading...
