Lennox EL296UHE Installation Instructions Manual page 33

EL296UHE DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
8" - 12"
(203MM - 305MM)
Minimum 12" (305MM)
INTAKE PIPE
INSULATION (optional)
above chimney top
plate or average snow
METAL TOP
accumulation
INSULATE
TO FORM
SEAL
*SIZE TERMINATION
PIPE PER TABLE 8.
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.
FIGURE 46
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 47 through 50 show typical terminations.
1 - Exhaust piping must terminate straight out or up as
shown. The termination pipe must be sized as listed in
table 8.The specified pipe size ensures proper veloc­
ity 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. See figure 48.
12" (305MM)
ABOVE AVE.
SNOW
ACCUMULATION
1/2" (13MM) FOAM
3" (76MM) OR
2" (51MM) PVC
PROVIDE SUPPORT
FOR EXHAUST LINES
NON-DIRECT VENT ROOF TERMINATION KIT
(15F75 or 44J41)
FIGURE 47
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
3"-8"
OF ROOF SLOPE *
(76MM-203MM)
EXHAUST VENT
1/2" (13MM)
WEATHERPROOF
INSULATION
SHOULDER OF FITTINGS
PROVIDE SUPPORT
OF PIPE ON TOP PLATE
SHEET
ALTERNATE
INTAKE PIPE
PLATE
3" - 8"
(76MM-
203MM)
EXTERIOR
PORTION OF
CHIMNEY
SIZE TERMINATION
PIPE PER TABLE 8.
INSULATION
UNCONDITIONED
ATTIC SPACE
1/2" (13MM) ARMAFLEX
INSULATION IN
UNCONDITIONED SPACE
FIELD-PROVIDED
REDUCER MAY
BE REQUIRED TO
ADAPT LARGER
VENT PIPE SIZE
TO TERMINATION
SIZE TERMINATION
PIPE PER TABLE 8.
NON-DIRECT VENT FIELD SUPPLIED WALL TERMINATION OR
(15F74) WALL TERMINATION KIT
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) as
shown in figure 49. When exhaust piping must be run
up an outside wall, any reduction in exhaust pipe size
must be done after the final elbow.
UNCONDITIONED
SPACE
*WALL SUPPORT
OUTSIDE WALL
FIELD-PROVIDED
REDUCER MAY BE
REQUIRED TO
ADAPT LARGER
VENT PIPE SIZE TO
TERMINATION
1/2" (13MM) FOAM
INSULATION IN
UNCONDITIONED
SPACE
NON-DIRECT VENT FIELD SUPPLIED WALL TERMINATION
EXTENDED OR (15F74) WALL TERMINATION VENT PIPE
*Use wall support every 24" (610). Use two supports if extension is
greater than 24" but less than 48".
Page 33
12" (305MM) MAX. for 2" (51MM)
20" (508MM) MAX. for 3" (76MM)
PVC REDUCER
Above Grade or
average snow
accumulation
FIGURE 48
12" (305MM) MAX. for 2" (51MM)
20" (508MM) MAX. for 3" (76MM)
6" (152MM)
Max
12" (305MM)
ABOVE GRADE OR
AVERAGE SNOW
ACCUMULATION
1/2" (13MM) FOAM
INSULATION
EXTENDED
FIGURE 49
1/2" (13MM)
ARMAFLEX
INSULATION
12" MIN.
(305MM)
SIZE TER­
MINATION
PIPE PER
TABLE 8.