User Guide

18 RH180 Manual
Vent Terminaon
All ue (Vent) gases must be directed to the outdoors of the building or structure and must not terminate
horizontally.
Venng Requirements
Lowest discharge opening
Listed
Listed
Roof pitch is x/12
H (minimum) –
Minimum height from
Figure 2
x
12
Roof Slope H (minimum)
 m
Flat to 6/12 1.0 0.30
Over 6/12 to 7/12 1.25 0.38
Over 7/12 to 8/12 1.5 0.46
Over 8/12 to 9/12 2.0 0.61
Over 9/12 to 10/12 2.5 0.76
Over 10/12 to 11/12 3.25 0.99
Over 11/12 to 12/12 4.0 1.22
Over 12/12 to 14/12 5.0 1.52
Over 14/12 to 16/12 6.0 1.83
Over 16/12 to 18/12 7.0 2.13
Over 18/12 to 20/12 7.5 2.27
Over 20/12 to 21/12 8.0 2.44
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  (2.4m) from a vercal
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  (2.4m) from a vercal wall or
similar obstrucon, the terminaon must end not less than 2  (0.6m) above any poron of a building within
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 ue collar.
Decorave shrouds or coverings shall not be installed over the gas vent terminaon unless listed for use with
the specic gas vent and are installed in accordance with the manufacturer’s installaon instrucons.
All gas vents shall extend through the roof ashing, roof jack, or roof thimble and terminate with a listed cap
or listed roof assembly.
The gas vent shall terminate at least 3  (0.9m) above any forced air inlet located within 10  (3.0m)
Table 1
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.