User Manual

Form 43471010
Dec 2017 -25-
9. Single-wall metal pipe shall not originate in any unoccupied attic or concealed space and shall not pass
through any attic, inside wall or concealed space, or through any floor. For the installation of a single-wall
metal pipe through an exterior combustible wall, refer to latest edition of the National Fuel Gas Code or the
authority having jurisdiction.
10. A venting system shall terminate at least 3 ft. above any forced air inlet located within 10 ft.
VENT TERMINATION (RESIDENTIAL INSTALLATIONS)
1. The vent terminal shall terminate above the roof line so that no discharge opening is less than 2 feet (0.6m)
horizontally from the roof surface. The lowest discharge opening will be no closer than the minimum height
specified in the following table. These minimum heights may be used provided the vent is not less than 8
feet (2.4m) from any vertical wall or similar obstruction.
2. All other gas vents shall terminate not less than 2 feet (0.6m) above the highest point where they pass
through the roof and at least 2 feet (0.6m) higher than any portion of a building located within 10 feet (3.1m)
as shown in the illustration below.
MINIMUM HEIGHT
FROM ROOF TO LOWEST DISCHARGE OPENING
Roof Pitch
H (min)
Flat to 6/12
1.0 Feet
Over 6/12 to 8/12
1.5 Feet
Over 8/12 to 10/12
2.5 Feet
Over 10/12 to 12/12
4.0 Feet
Over 12/12 to 16/12
6.0 Feet
Over 16/12 to 20/12
7.5 Feet
Over 20/12 to 21/12
8.0 Feet