Rheem RTGH-C95DVLN Installation Instructions Manual page 25

Venting for Direct-Vent Water Heater (cont.)
Vertical Vent Terminal Location
12" Min.
(300 mm)
A, B
The following chart with diagrams details the minimum dimensional information needed to determine the proper
location of the vertical vent terminal for direct-vent indoor tankless water heaters:
Location
A = Minimum clearance above the roof
level.
B = Maximum clearance above roof
level (without additional support for
vent pipe).
C = Required vent clearance from any
gable, dormer, or other roof struc-
ture with building interior access
(i.e., vent, window).
D = Required vent clearance from any
forced air inlet, including dryer and
furnace air inlets.
E = Minimum/maximum horizontal dis-
tance between vent terminals
1 In accordance with current ANSI Z223.1/NFPA 54 National Fuel Gas Code.
2 In accordance with current CAN/CSA B149.1 Installation Codes.
The vertical intake air termination requires a return
bend or two short or long sweep radius 87° elbows
to keep the inlet downward and prevent entry of rain.
Refer to figure above for the proper location of the air
intake with respect to the exhaust outlet termination.
INSTALLATION INSTRUCTIONS
Air Intake
U.S. Installation Requirements
1
12 in. (30 cm) above roof level.
24 in. (61 cm) above roof level.
4 ft. (1.2 m)
10 ft. (3 m)
36 in. (91 cm)/20 ft. (6.1 m)
The vertical exhaust outlet termination terminates
at least 12 inches (30 cm) above the air intake
termination. The exhaust outlet terminations must be at
least 12 inches (30 cm) in US [at least 18 inches (46
cm) in Canada] above the roof line or anticipated snow
levels.
Vent Pipe
Through Roof
Canadian Installation Requirements
18 in. (45.7 cm) above roof level.
24 in. (61 cm) above roof level.
4 ft. (1.2 m)
6 ft. (1.8 m)
36 in. (91 cm)/20 ft. (6.1 m)
2
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