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7 - I f intake and exhaust piping must be run up a side
wall to position above snow accumulation or other
obstructions, piping must be supported. At least
one bracket must be used within 6” from the top of
the elbow and then every 24” (610mm) as shown
in FIGURE 37, to prevent any movement in any
direction. When exhaust and intake piping must be
run up an outside
* Use wall support every 24” (610 mm). Use two
wall supports if extension is greater than
24” (610 mm) but less than 48” (1219 mm).
NOTE − One wall support must be within 6” (152 mm)
from top of each pipe (intake and exhaust) to prevent
movement in any direction.
NOTE − FIELD−PROVIDED
REDUCER MAY BE
REQUIRED TO ADAPT
LARGER VENT PIPE SIZE
TO TERMINATION
STRAIGHT
APPPLICATION
EXTENDED
APPLICATION
D
B
D
B
A
2” (51mm)
Vent Pipe
3” (76mm)
Vent Pipe
A
− Minimum clearance
above grade or average
snow accumulation
B
− Maximum horizontal
separation between
intake and exhaust
D
− Maximum exhaust
pipe length
E
− Maximum wall support
distance from top of each
pipe (intake/exhaust)
12” (305 mm)
12” (305 mm)
12” (305 mm)
6” (152 mm)
6” (152 mm)
6” (152 mm)
6” (152 mm)
8” (203 mm)
8” (203 mm)
20” (508 mm)
6” (152 mm)
6” (152 mm)
Front View of
Intake and Exhaust
Intake
Exhaust
A
C
B
1
2
D
A
C
3
Intake
Elbow
Exhaust
B
A
D
Intake
Elbow
* WALL
SUPPORT
B
A
D
E
B
D
E
A
ALTERNATE TERMINATIONS (TEE & FORTY−FIVE DEGREE ELBOWS ONLY)
D
C
12”
1
2
E
B
A
1
2
As required. Flue gas may be acidic and may adversely affect some building materials. If a side wall vent
termination is used and flue gases will impinge on the building materials, a corrosion−resistant shield
(24 inches square) should be used to protect the wall surface. If optional tee is used, the protective shield
is recommended. The shield should be constructed using wood, sheet metal or other suitable material.
All seams, joints, cracks, etc. in affected area, should be sealed using an appropriate sealant.
3
Exhaust pipe 45
°
elbow can be rotated to the side away from the combustion air inlet to direct exhaust
away from adjacent property. The exhaust must never be directed toward the combustion air inlet.
C2 -
Minimum from end of
exhaust to inlet of intake
C1 -
Minimum from end of
exhaust to inlet of intake
FIELD FABRICATED WALL TERMINATION
C1
C2
C1
C2
See maximum allowable venting tables for venting
lengths with this arrangement.
D
C
12”
1
2
E
B
A
The exhaust termination tee should be connected to the 2” or 3” PVC flue pipe as shown in the illustration. In
horizontal tee applications
there must be be a minimum of 3 ft away from covered patios or any living ares and
cannot be within 3 ft of a window. Do not use an accelerator in applications that include an exhaust termination
tee. The accelerator is not required.
C
E
B
A
D
2” (51mm)
Vent Pipe
3” (76mm)
Vent Pipe
A
- Clearance above
Grade or average snow
accumulation
B
- Horizontal separation
between intake and exhaust
C
- Minimum from end of
exhaust to inlet of intake
D
- Exhaust pipe length
E
- Wall support distance from
top of each pipe
(intake/exhaust)
12” (305 mm) Min 12” (305 mm) Min
6” (152mm)min
24” (610mm )Max
6” (152mm)min
24” (610mm )Max
9” (227mm)
9” (227mm)
12” (305mm)min
16” (405mm )Max
12” (305mm)min
16” (405mm )Max
6” (152mm) Max
6” (152mm) Max
FIGURE 37
wall, the exhaust piping must be terminated with pipe
sized per TABLE 24.The intake piping may be equipped
with a 90° elbow turndown. Using turndown will add 5
feet (1.5m) to the equivalent length of the pipe.
8 - A multiple furnace installation may use a group
of up to four terminations assembled together
horizontally, as shown in FIGURE 40.
