Lennox ML196DF045XE36B Manual page 35

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 pre­
ferred. Figures 41 and 42 show typical terminations.
1. Exhaust piping must terminate straight out or up as
shown. The termination pipe must be sized as listed in
table 15.The specified pipe size ensures proper ve­
locity required to move the exhaust gases away from
the building.
2. On field supplied terminations for side wall exit, ex­
haust piping may extend a maximum of 12 inches
(305mm) for 2" PVC and 20 inches (508mm) for 3"
(76mm) PVC beyond the outside wall.
3. If exhaust piping must be run up a side wall to position
above snow accumulation or other obstructions, pip­
ing 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 mul­
tiple furnaces must meet local codes.
12" (305mm)
ABOVE AVE.
SNOW
1/2" (13mm) FOAM
ACCUMULATION
3" (76mm) OR
2" (51mm) PVC
PROVIDE SUPPORT
FOR EXHAUST LINES
NON-DIRECT VENT ROOF TERMINATION KIT
(15F75 or 44J41)
FIGURE 41
SIZE TERMINATION
PIPE PER TABLE
15.
INSULATION
UNCONDITIONED
ATTIC SPACE
ML196DFE NON-DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
SIZE TERMINATION
PIPE PER TABLE 15.
Minimum 12" (305MM)
above chimney top
plate or average snow
accumulation
SHEET
METAL TOP
PLATE
INSULATE
TO FORM
SEAL
NOTE - Do not discharge exhaust gases directly into any chimney or vent stack. If ver­
tical 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 illus­
trated. In any exterior portion of chimney, the exhaust vent must be insulated.
Condensate Piping
This unit is designed for either right‐ or left‐side exit of con­
densate piping. Refer to figure 43 for condensate trap loca­
tions.
NOTE - If necessary the condensate trap may be installed
up to 5 feet away from the furnace. Piping from furnace
must slope down a minimum of 1/4" per ft. toward trap.
CONDENSATE TRAP AND PLUG LOCATIONS
Trap
(same on
right side)
1-1/2 in.
Page 35
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
OF ROOF SLOPE
3" - 8"
EXHAUST VENT
(76mm-
1/2" (13mm)
203mm)
WEATHERPROOF
INSULATION
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
3" - 8"
(76mm-
203mm)
EXTERIOR
PORTION OF
CHIMNEY
FIGURE 42
Plug
(same on left
side)
FIGURE 43