39
Venting
INSTALLATION INSTRUCTIONS
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 Power Vent (Room Air Application)
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).
4 feet (1.2 m) below or to side of
opening; 1 foot (300 mm) above
opening.
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 building or the combustion air
inlet to 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).
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) horizontally.
L = Clearance above paved sidewalk or
paved driveway located on public
7 feet (2.13 m)+ 7 feet (2.13 m)+
M = Clearance under veranda, porch, deck
or balcony.
12 inches (30 cm)
*
FOR YOUR SAFETY
DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. To do so may result in an
explosion or fire.
This water heater can use room air for combustion and ventilation as long as the installation complies with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54, and other applicable standards and local codes. Failure to comply with these standards and other instructions on
the Common Vent Installation Instructions and the Tankless Water Heater Use and Care Manual may result in death or serious injury and/or
damage to property.
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