Rinnai RH180 Operation And Installation Manual page 18

Ven ng Requirements
Inspec on: The en re length of the vent connector shall be readily accessible for inspec on, cleaning and
replacement.
Joints: Must be fastened by sheet metal screws or other approved methods.
Support: Vent connectors must be supported per the vent manufacturer's installa on instruc ons to avoid
dips or sags in the vent and maintain the required clearances.
Vent Termina on
All flue (Vent) gases must be directed to the outdoors of the building or structure and must not terminate
horizontally.
Table 1
Roof Slope
Flat to 6/12
Over 6/12 to 7/12
Over 7/12 to 8/12
Over 8/12 to 9/12
Over 9/12 to 10/12
Over 10/12 to 11/12
Over 11/12 to 12/12
Over 12/12 to 14/12
Over 14/12 to 16/12
Over 16/12 to 18/12
Over 18/12 to 20/12
Over 20/12 to 21/12
The vent termina on shall comply with the following requirements:
If the gas vent is 12 inches (300mm) or less in diameter and located not less than 8
wall or similar obstruc on, the termina on must comply with the requirements stated in Table 1 and Figure
2. If the gas vent is greater than 12 inches in diameter or located less than 8
similar obstruc on, the termina on must end not less than 2
10 (3.0m) horizontally.
B-Vent type gas vent shall terminate at least 5 (1.5m) in ver cal height above the highest connected
appliance dra hood or flue collar.
Decora ve shrouds or coverings shall not be installed over the gas vent termina on unless listed for use with
the specific gas vent and are installed in accordance with the manufacturer's installa on instruc ons.
All gas vents shall extend through the roof flashing, roof jack, or roof thimble and terminate with a listed cap
or listed roof assembly.
The gas vent shall terminate at least 3
18
H (minimum)
m
1.0 0.30
1.25 0.38
1.5 0.46
2.0 0.61
2.5 0.76
3.25 0.99
4.0 1.22
5.0 1.52
6.0 1.83
7.0 2.13
7.5 2.27
8.0 2.44
(0.9m) above any forced air inlet located within 10
RH180 Manual
Figure 2
Lowest discharge opening
Listed
Listed
(0.6m) above any por on of a building within
x
12
Roof pitch is x/12
H (minimum) –
Minimum height from
(2.4m) from a ver cal
(2.4m) from a ver cal wall or
(3.0m)