Rheem RTG-3 Series Use And Care Manual page 33

Venting for Direct-Vent Water Heater
Vertical Vent Terminal Location
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 = Minimum clearance above anticipated snow level�
C = Maximum clearance above roof level (without ad-
ditional vent support)�
D = Maximum clearance above anticipated snow level
(requires additional vent support)�
E = Required vent clearance from any gable, dormer, or
other roof structure with building access (i�e�, vent,
window)�
F = Required vent clearance from any forced air inlet,
including dryer and furnace air inlets�
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�
NOTICE:
Only manufacturer-approved termination and parts
should be used during installation.
INSTALLATION INSTRUCTIONS
U�S� Installation
Requirements
1
12 in� (30�5 cm) above roof level�
12 in� (30�5 cm) above
anticipated snow level�
24 in� (61 cm) above roof level�
24 in� (61 cm) above anticipated snow
level�
4 ft� (1�2 m)�
10 ft� (3 m)
Canadian Installation
Requirements
2
18 in� (45�7 cm) above roof level�
12 in� (30�5 cm) above anticipated snow
level�
24 in� (61 cm) above roof level�
24 in� (61 cm) above anticipated snow
level�
4 ft� (1�2 m)�
6 ft� (1�8 m)
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