44
Venting
INSTALLATION INSTRUCTIONS
Vertical Vent Terminal Location
A, B
12" Min.
(300 mm)
Vent Pipe
Through Roof
Optional
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
U.S. Installation
Requirements
1
Canadian Installation
Requirements
2
A = Minimum clearance above the roof
level.
12 in. (30.5 cm) above roof level.
18 in. (45.7 cm) above roof level.
B = Maximum clearance above roof
level (without additional support for
vent pipe).
24 in. (61 cm) above roof level.
24 in. (61 cm) above roof level.
C = Required vent clearance from any
gable, dormer, or other roof struc-
ture with building interior access
(i.e., vent, window).
4 ft. (1.2 m)
4 ft. (1.2 m)
D = Required vent clearance from any
forced air inlet, including dryer and
furnace air inlets.
10 ft. (3 m)
6 ft. (1.8 m)
E = Minimum/maximum horizontal dis-
tance between vent terminals
5.5 in. (14 cm)/24 in. (61 cm)
5.5 in. (14 cm)/24 in. (61 cm)
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 90° 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. The vertical exhaust outlet termination
is a 2-inch or 3-inch pipe which terminates at least 12
inches (30.5cm) above the air intake termination. The
exhaust outlet terminations must be at least 18 inches
(45.7cm) (12 inches (30.5cm) in US) above the roof line
or anticipated snow levels.
Venting for Direct-Vent Water Heater (cont.)
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