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Details of Exhaust Piping Terminations for Non-
Direct Vent Applications
Exhaust pipe 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 38 through Figure 39 show typical
terminations.
1.
Exhaust piping must terminate straight out or up as
shown. The termination pipe must be sized as listed
in Table 7A through Table 7D. 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.
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). 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
3" (76MM) OR
2" (51MM) PVC
PROVIDE SUPPORT
FOR EXHAUST LINES
Figure 38. Non-Direct Vent Roof Termination Kit
507769-05G / 31-5000656
SIZE PER EXHAUST PIPE
TERMINATION SIZE
REDUCTION TABLE
UNCONDITIONED
ATTIC SPACE
Issue 2223
* SIZE TERMINATION PIPE PER EXHAUST
PIPE TERMINATION SIZE REDUCTION TABLE
Minimum 12" (305mm)
above chimney top
plate or average snow
accumulation
INTAKE PIPE
INSULATION (optional)
SHEET
METAL TOP
PLATE
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 39. Non-Direct Vent Application Using Existing
Chimney
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
OF ROOF SLOPE *
EXHAUST VENT
1/2" (13mm)
WEATHERPROOF
INSULATION
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
EXTERIOR
PORTION OF
CHIMNEY
Page 29 of 55
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