The vent/flue pipe may terminate vertically, as through a roof,
or horizontally, as through an outside wall.
Vertical vent/flue pipe terminations should be as shown in
"Vertical Vent Termination (Single Pipe)" illustration. Refer to
"Termination Locations" in this section for details concerning
location restrictions.
The penetration of the vent through the roof must be sealed
tight with proper flashing such as is used with a plastic
plumbing vent.
Horizontal vent/flue pipe terminations should be as shown in
"Horizontal Vent Termination (Single Pipe)" illustration. Refer
to "Termination Locations" in this section for details
concerning location restrictions.
A 2³⁄₈" (6.1 cm) diameter wall penetration is required for 2"
(5.1 cm) diameter pipe.
A 3" (7.6 cm) diameter hole is required for a 2¹⁄₂" (6.4 cm)
pipe.
A 3¹⁄₂" (8.9 cm) diameter hole is required for 3" (7.6 cm)
diameter pipe.
To secure the pipe passing through the wall and prohibit
damage to the piping connections, a coupling should be
installed on either side of the wall and solvent cemented to a
length of pipe connecting the 2 couplings.
The length of pipe should be the wall thickness plus the
depth of the socket fittings to be installed on the inside and
outside of the wall.
The wall penetration should be sealed with silicone caulking
material.
In a basement installation, the vent/flue pipe can be run
between joist spaces.
NOTE: If the vent pipe must go below a joist and then up into
the last joist space to penetrate the header, two 45° elbows
should be used to reach the header rather than two 90°
elbows.
Vertical Vent Termination (Single Pipe)
A
B
A. Tee (optional)
B. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
16
Vent/Flue Pipe Terminations
Alternate Vertical Vent Termination (Single Pipe)
Standard Horizontal Vent Termination (Single Pipe)
A. Inside building
B. Wall
C. Outside building
D. Tee or 90º elbow turned
down
Standard Horizontal Vent Termination (Single Pipe)—
Above Highest Anticipated Snow Level
B
A. 12" (30.5 cm) minimum from wall
B. Tee or 90º elbow turned down
C. 12" (30.5 cm) minimum to roof or highest anticipated snow level
A
A. 90º medium radius elbows
B. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
B
C
A
G
F
H
E. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
F. 12" (30.5 cm) minimum from wall
G. Coupling
H. Elbow or coupling
A
B
C
B
D
E