Form 43471000
-20-
Sept 2011
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 Cap
Flashing
2 (5cm)
Clearance
Thimble
Seal Joint
and Annular
Space
10 ft (305cm)
or less
2 ft (77cm)
minimum
2 ft (77cm) minimum
(when no wall or
parapet exists)
4 Diameter
Vent
W
all or
Parapet
#10 Self-Drill
Screws
(typical)
4 Vent Pipe
(vertical position)
Draft Inducer
(vertical position)
VENT TERMINATION (RESIDENTIAL INSTALLATIONS)
VENT TERMINATION (RESIDENTIAL INSTALLATIONS)
VENT TERMINATION (RESIDENTIAL INSTALLATIONS)
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.
Not less than 8ft. (244cm)
2ft. (61cm)
minimum
H
minimum
V
ertical W
all
10ft. (305cm) or less
2ft. (61cm)
minimum
Vent Cap
Type B
Vent Pipe
Type B
(Double Wall)
Storm
Collar
Boot
Flashing
Vent Pipe
(Single Wall)
2 (51mm)
Clearance
Seal Joint &
Annular Space
MINIMUM HEIGHT
MINIMUM HEIGHT
MINIMUM HEIGHT
MINIMUM HEIGHT
FROM ROOF TO LOWEST DISCHARGE OPENING
FROM ROOF TO LOWEST DISCHARGE OPENING
FROM ROOF TO LOWEST DISCHARGE OPENING
FROM ROOF TO LOWEST DISCHARGE OPENING
Roof Pitch
Roof Pitch
Roof Pitch
Roof Pitch
H (min)
H (min)
H (min)
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
