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Details of Exhaust Piping Terminations for Non-
Direct Vent Applications
Exhaust pipes may be routed either horizontally through
an outside wall or vertically through the roof. In attic or
closet installations, vertical termination through the roof
is preferred. Figure 44 through Figure 47 show typical
terminations.
1.
Exhaust piping must terminate straight out or up as
shown. The termination pipe must be sized as listed
in Table 7. The specified pipe size ensures proper
velocity required to move the exhaust gases away
from the building.
2.
On field supplied terminations for side wall exit,
exhaust piping may extend a maximum of 12 inches
(305 mm) for 2" PVC and 20" (508 mm) for 3" (76 mm)
PVC beyond the outside wall. See Figure 45.
3.
If exhaust piping must be run up a sidewall to position
above snow accumulation or other obstructions, piping
must be supported every 24" (610 mm) as shown in
Figure 46. When exhaust piping must be run up an
outside wall, any reduction in exhaust pipe size must
be done after the final elbow.
12" (305MM)
ABOVE AVE.
SNOW
ACCUMULATION
INSULATION IF REQUIRED
3" (76MM) OR
2" (51MM) PVC
PROVIDE SUPPORT
FOR EXHAUST LINES
Figure 44. Non-Direct Vent Roof Termination Kit
(15F75 or 44J41)
FIELD-PROVIDED
REDUCER MAY BE
REQUIRED TO
ADAPT DIFFERENT
VENT PIPE SIZE TO
TERMINATION
SIZE TERMINATION
PER EXHAUST PIPE
TERMINATION SIZE
REDUCTION TABLE
Figure 45. Non-Direct Vent Field Supplied Wall
Termination
508390-01
1/2" (13 mm) FOAM
UNCONDITIONED
ATTIC SPACE
FIELD-PROVIDED
REDUCER MAY BE
REQUIRED TO
ADAPT DIFFERENT
VENT PIPE SIZE TO
TERMINATION
* Use wall support every 24" (610 mm). Use two supports of extension is greater than 24"
Figure 46. Non-Direct Vent Field Supplied Wall
Minimum 12" (305MM)
above chimney top
plate or average snow
accumulation
METAL TOP
INSULATE
TO FORM
SEAL
NOTE:
Do not discharge exhaust gases directly into any
chimney or vent stack. If vertical discharge through an
existing unused chimney or stack is required, insert piping
inside chimney until the pipe open end is above top of
chimney and terminate as illustrated. In any exterior portion
of chimney, the exhaust vent must be insulated.
Figure 47. Non-Direct Vent Application Using Existing
Exhaust through Crawl Space Vent Option
All 33" condensing gas furnaces (92%+) are now approved
to be vented down through a crawl space. Ensure a vent
pipe drain kit, 51W18 (USA) or 15Z70 (Canada), is used as
directed through the floor joists and into the crawl space.
See the following figures.
Issue 2327
(610 mm) but less than 48" (1219 mm).
Termination Extended
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
OF ROOF SLOPE
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
SHEET
PLATE
EXTERIOR
PORTION OF
CHIMNEY
Chimney
SIZE TERMINATION
PER EXHAUST PIPE
TERMINATION SIZE
REDUCTION TABLE
Page 31 of 60
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