Rheem RTGH Owners Manual

39
INSTALLATION INSTRUCTIONS
Venting for Direct-Vent Water Heater
Venting
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 Other than 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).
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 property.
7 feet (2.13 m)+ 7 feet (2.13 m)+
M = Clearance under veranda, porch, deck
or balcony.
12 inches (30 cm)
*