Lennox ML193UH030XE36B Installation Instructions Manual page 26

7 - If intake and exhaust piping must be run up a side
wall to position above snow accumulation or other
obstructions, piping must be supported. At least
one bracket must be used within 6" from the top of
the elbow and then every 24" (610mm) as shown
in FIGURE 41, to prevent any movement in any
direction. When exhaust and intake piping must be
run up an outside wall, the exhaust piping must be
terminated with pipe sized per TABLE 8.The intake
piping may be equipped with a 90° elbow turndown.
Using turn-down will add 5 feet (1.5m) to the
equivalent length of the pipe.
8 - A multiple furnace installation may use a group of up
to four terminations assembled together horizontally,
as shown in FIGURE 39.
12" (305mm)
Minimum
Above Average
Snow
Accumulation
CLAMP
DIRECT VENT CONCENTRIC ROOFTOP TERMINATION
71M80, 69M29 or 60L46 (US)
44W92 or 44W93 (Canada)
FIGURE 37
FIELD-PROVIDED
REDUCER MAY BE
REQUIRED TO ADAPT
DIFFERENT VENT PIPE
OUTSIDE
SIZE TO TERMINATION
WALL
EXHAUST
AIR
INTAKE
CLAMP
AIR
(Not Furnished)
DIRECT VENT CONCENTRIC WALL TERMINATION
71M80, 69M29 or 60L46 (US)
44W92 or 44W93 (Canada)
FIGURE 38
Accelerator not required for
3" concentric
FLASHING
(Not Furnished)
INTAKE
SHEET METAL STRAP
(Clamp and sheet metal strap
must be field installed to support
the weight of the termination kit.)
FIELD-PROVIDED
REDUCER MAY BE REQUIRED
TO ADAPT DIFFERENT VENT
PIPE SIZE TO TERMINATION
Accelerator not required
for 3" concentric
INTAKE
AIR
EXHAUST
AIR
INTAKE 12" (305mm) Min.
AIR
above grade or
average snow ac
cumulation.
GRADE
EXHAUST
VENT
INTAKE
AIR
Inches (mm)
optional intake elbow
OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT
INSTALLATION OF DIRECT VENT WALL TERMINATION KIT
2" EXTENSION FOR 2" PVC
PIPE1" EXTENSION FOR 3"
PVC PIPE
FURNACE
INTAKE
PIPE
FLUSH-MOUNT SIDE WALL TERMINATION KIT
51W11 (US) or 51W12 (Canada)
Page 26
12"
(305mm)
5-1/2"
5"
(140mm)
(127mm)
Front View
18" MAX.
(457mm)
EXHAUST VENT
12" (305mm) Min.
above grade or
INTAKE
cumulation.
AIR
Side View
(30G28 or 81J20)
FIGURE 39
FURNACE
EXHAUST
4''
PIPE
GLUE EXHAUST
END FLUSH INTO
TERMINATION
FLAT
1-1/2" ACCELERATOR
SIDE
FIGURE 40