38
Venting
INSTALLATION INSTRUCTIONS
Regulator
vent outlet
Fixed
closed
Fixed
closed
Inside
corner detail
Operable
Operable
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 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 Btuh (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.
*
*
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.
*
*
I = Clearance to service regulator vent
outlet.
Above a regulator within 3 feet (91 cm)
horizontally of the vertical center line of the
regulator vent outlet to a maximum vertical
distance of 15 feet (4.5 m).
*
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 sidewalk
or paved driveway located on
public property.
7 feet (2.13 m)+
*
M = Clearance under veranda, porch,
deck or balcony.
12 inches (30 cm)
*
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