Lennox G61MPVT-36B-070 Installation Instructions Manual page 19

7 − On field supplied terminations, a minimum separation
distance between the end of the exhaust pipe and the
end of the intake pipe is 203mm (8 inches).
TABLE 7
EXHAUST PIPE TERMINATION SIZE REDUCTION
G61MPVT
Exhaust Pipe Size
MODEL
070 50 or 80mm
090 50 or 80mm
110 80mm
135 80mm
*Approved 3" concentric termination kit terminates with 2−5/8" ID pipe.
76mm MAX.
203 mm MIN
80mm or
50mm PVC
PROVIDE SUPPORT
FOR INTAKE AND
EXHAUST LINES
DIRECT VENT ROOF TERMINATION KIT
FIGURE 22
EXHAUST
TERMINATION
INTAKE
TERMINATION
EXHAUST
DIRECT VENT CONCENTRIC ROOFTOP TERMINATION
(71M80, 69M29 or 60L46)
FIGURE 23
Termination Pipe Size
40mm
50mm
50mm*
50mm*
SIZE TERMINATION
PIPE PER TABLE 7.
UNCONDITIONED
ATTIC SPACE
13mm FOAM
INSULATION IN
UNCONDITIONED
SPACE
FIELD−PROVIDED
REDUCER MAY BE REQUIRED
TO ADAPT LARGER VENT
PIPE SIZE TO TERMINATION
INTAKE
EXHAUST
FIELD−PROVIDED
REDUCER MAY
BE REQUIRED TO
ADAPT LARGER
VENT PIPE SIZE
TO TERMINATION
DIRECT VENT CONCENTRIC WALL TERMINATION
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. Figure 25 shows a typical terminations.
1 − Exhaust piping must terminate straight out or up as
shown. The termination pipe must be sized as listed in
table 7.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 305mm (12
inches) beyond the outside wall, unless support is pro-
vided in the horizontal section.
80mm or
50mm PVC
PROVIDE SUPPORT
FOR EXHAUST LINES
NON−DIRECT VENT ROOF TERMINATION KIT
Page 19
INTAKE
TERMINATION
TERMINATION
INTAKE
305mm Min.
above ground level.
(71M80, 69M29 or 60L46)
FIGURE 24
SIZE TERMINATION
PIPE PER TABLE 7.
UNCONDITIONED
ATTIC SPACE
FIGURE 25
EXHAUST