Lennox ELITE Series Installation Instructions Manual page 28

Details of Intake and Exhaust Piping Terminations for
Direct Vent Installations
NOTE - In Direct Vent installations, combustion air is taken
NOTE -
ly through an outside wall or vertically through the roof. In
attic or closet installations, vertical termination through the
roof is preferred. Figure 34 through Figure 41 show typical
terminations.
1 - Intake and exhaust terminations are not required
intake on one side of the structure and the exhaust
on another side (Figure 35). You may exit the
exhaust out the roof and the intake out the side of
the structure (Figure 36).
2 - Intake and exhaust pipes should be placed as close
together as possible at termination end (refer to
illustrations). Maximum separation is 3" (76mm)
on roof terminations and 6" (152mm) on side wall
terminations.
NOTE -
3 - On roof terminations, the intake piping should
terminate straight down using two 90° elbows (See
Figure 34).
4 - Exhaust piping must terminate straight out or up as
shown. A reducer may be required on the exhaust
piping at the point where it exits the structure to
improve the velocity of exhaust away from the intake
piping. See TABLE 8.
NOTE -
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. Intake piping
should be as short as possible. See Figure 42.
between the end of the exhaust pipe and the end of
the intake pipe without a termination elbow is 8" and
a minimum distance of 6" with a termination elbow.
See Figure 42.
Inches(mm)
8" (203mm) MIN
-
12" (305mm) ABOVE
AVERAGE SNOW
ACCUMULATION
-
3" (76mm) OR
2" (51mm) PVC
PROVIDE SUPPORT
FOR INTAKE AND
EXHAUST LINES
-
DIRECT VENT ROOF TERMINATION KIT
Exiting Exhaust and Intake Vent
(different pressure zone)
Exhaust
Pipe
Exiting Exhaust and Intake Vent
(different pressure zone)
Roof T erminated
Exhaust Pipe
Exhaust Pipe Termination Size Reduction
EL196UHE Model
*030, *045, *070
*090
110
Page 28
3"(76mm) MAX.
UNCONDITIONED
ATTIC SPACE
(15F75 or 44J41)
Figure 34
Furnace
(Minimum 12 in.
305 MM) above
grade or snow
accumulation
Figure 35
Inlet Air
(Minimum 12 in.
Furnace
305 MM) above
grade or snow
accumulation
Figure 36
TABLE 8
1-1/2" (38mm)
2" (51mm)
Inlet Air