14
Installation
D
V
V
E
FIXE
D
CLO
SED
OPE
RAB
LE
OPE
RAB
LE
FIXE
D
CLOS
ED
v
v
B
L
F
C
B
v
v
v
X
B
B
B
A
J
C
I
H
X
v
M
K
v
G
A
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
Horizontal Vent Terminal Location for Power Direct Vent
Canadian Installations
1
US Installations
2
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 inches (15 cm) for appliances < 10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3kW) and
< 100,000 Btuh (30kW), 36 inches (91 cm)
for appliances > 100,000 Btuh (30kW).
6 inches (15 cm) for appliances.< 10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Buth (3 kW) and
< 50,000 Btuh (15 kW), 12 inches (30 cm)
for appliances > 50,000 Btuh (15 kW)
C= Clearance to permanently closed
window.
*
*
D= Vertical Clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 feet (61 cm)
from the center line of the terminal.
*
*
E= Clearance to unventilated soffit.
*
*
F= Clearance to outside corner.
*
*
G= Clearance to inside corner.
*
*
Figure 8
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."
H = Clearance to each side of center line
extended meter/regulator assembly.
above
3 feet (91 cm) within a height 15 feet (4.57
m) above the meter/regulator assembly.
*
I = Clearance to service regulator vent
outlet.
3 feet (91 cm)
*
J = Clearance to nonmechanical air supply
inlet to
the
building or the combustion
air inlet of any other appliance..
6 inches (15 cm) for appliances < 10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3kW) and
< 100,000 Btuh (30kW), 36 inches (91 cm)
for appliances > 100,000 Btuh (30kW).
6 inches (15 cm) for appliances.< 10,000
Btuh (3 kW), 9 inches (23 cm) for
appliances > 10,000 Buth (3 kW) and
< 50,000 Btuh (15 kW), 12 inches (30 cm)
for appliances > 50,000 Btuh (15 kW)
K = Clearance to mechanical
air supply
inlet.
6 feet (1.83 m)
3 feet (91 cm) above if within 10 feet(3 m)
horizontally.
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.
Not Allowed
Not Allowed
