Lennox G51MP SERIES Installation Instructions Manual page 29

12" (305) MAX. for 2" (51)
20" (508) MAX. for 3" (76)
INTAKE
AIR
GRADE
É É É É É É É É É É
WALL TERMINATION KIT (22G44, 44J40, 30G28 or 81J20) EXTENDED VENT FOR GRADE CLEARANCE
G51MP DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
8" − 12"
(203mm − 305mm)
INTAKE PIPE
INSULATION (optional)
MINIMUM 12"
(305mm) ABOVE
ROOF OR AVERAGE METAL TOP
SNOW
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 39
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 40 through 43 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 exits, ex-
haust piping should extend a maximum of 12 inches
(305mm) beyond the outside wall. See figure 41.
Inches (mm)
EXHAUST
AIR
8" (203)
Minimum
12" MIN.
(305)
Above Grade or
average snow
accumulation
Side View
DIRECT VENT TERMINATION
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
SHEET
ALTERNATE
INTAKE PIPE
PLATE
3" − 8"
(76mm−
203mm)
EXTERIOR
PORTION OF
CHIMNEY
12"
(305)
INTAKE
AIR
5"
(127)
5-1/2"
(140)
É É É É É É É É É É
FIGURE 38
Inches(mm)
12" (305mm)
ABOVE AVE.
SNOW
ACCUMULATION
3" (76) OR
2" (51) PVC
PROVIDE SUPPORT
FOR EXHAUST LINES
NON−DIRECT VENT ROOF TERMINATION KIT
1/2" (13) ARMAFLEX
INSULATION IN
UNCONDITIONED SPACE
FIELD−PROVIDED
REDUCER MAY
BE REQUIRED TO
ADAPT LARGER
VENT PIPE SIZE
TO TERMINATION
Inches (mm)
NON−DIRECT VENT WALL RING KIT
Page 29
COVER EXHAUST
VENT WITH
1/2" (13)
FOAM
INSULATION
EXHAUST
AIR
12" MIN.
(305)
Above Grade or
average snow
accumulation
GRADE
Front View
SIZE TERMINATION
PIPE PER TABLE 8.
UNCONDITIONED
ATTIC SPACE
(15F75 or 44J41)
FIGURE 40
12" (305) Max. for 2" (51)
1/2" (13)
ARMAFLEX
INSULATION
PVC REDUCER
SIZE TERMINATION
PIPE PER TABLE 8.
TOP VIEW
(15F74)
FIGURE 41