508107-01
Issue 2041
Page 38 of 58
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 40 through Figure 41 show typical
terminations.
1.
Exhaust piping must terminate straight out or up as
shown. The termination pipe must be sized as listed
in Table 14. 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
(305mm) for 2” PVC and 20 inches (508mm) for 3”
(76mm) PVC beyond the outside wall.
Figure 40.
Non-Direct Vent Roof Termination Kit
15F75 or 44J41)
UNCONDITIONED
ATTIC SPACE
3” (76MM) OR
2” (51MM) PVC
PROVIDE SUPPORT
FOR EXHAUST LINES
12” (305MM)
ABOVE AVE.
SNOW
ACCUMULATION
SIZE PER EXHAUST PIPE
TERMINATION SIZE
REDUCTION TABLE
3. If exhaust piping must be run up a side wall to position
above snow accumulation or other obstructions, piping
must be supported every 24 inches (610mm). When
exhaust piping must be run up an outside wall, any
reduction in exhaust pipe size must be done after the
final elbow.
4.
Distance between exhaust pipe terminations on
multiple furnaces must meet local codes.
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
OF ROOF SLOPE
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
EXTERIOR
PORTION OF
CHIMNEY
INSULATE
TO FORM
SEAL
SHEET
METAL TOP
PLATE
Minimum 12” (305MM)
above chimney top
plate or average snow
accumulation
* SIZE TERMINATION PIPE
PER EXHAUST PIPE TERMINATION
SIZE REDUCTION TABLE
Figure 41.
Non-Direct Vent Application Using Existing
Chimney