Lennox ML193UH045P36B Unit Information page 32

7. If intake and exhaust piping must be run up a side wall
to position above snow accumulation or other ob­
structions, piping must be supported. At least one
bracket must be used within 6" from the top of the el­
bow 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 17.The intake piping may be equipped
with a 90° elbow turndown. Using turndown 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 38.
EXHAUST
VENT
12" (305mm)
Minimum
Above Average
Snow
Accumulation
CLAMP
DIRECT VENT CONCENTRIC ROOFTOP TERMINATION
71M80, 69M29 or 60L46 (US)
44W92 or 44W93 (Canada)
FIGURE 36
FIELD-PROVIDED
REDUCER MAY BE REQUIRED
TO ADAPT LARGER VENT
PIPE SIZE TO TERMINATION
OUTSIDE
WALL
EXHAUST
VENT
INTAKE
CLAMP
AIR
(Not Furnished)
DIRECT VENT CONCENTRIC WALL TERMINATION
71M80, 69M29 or 60L46 (US)
44W92 or 44W93 (Canada)
FIGURE 37
1 1/2" (38mm) accelerator
provided on 71M80 & 44W92
kits for ML193UH045P24B,
070P24B & 070P36B
FLASHING
INTAKE
(Not Furnished)
AIR
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 LARGER VENT
PIPE SIZE TO TERMINATION
1-1/2" (38mm) accelerator
provided on 71M80 & 44W92
kits for ML193UH045P24B,
070P24B & 070P36B
INTAKE
AIR
EXHAUST
VENT
12" (305mm) Min.
INTAKE
AIR above grade or
average snow
accumulation.
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
51W11 (US) or 51W12 (Canada)
ML193UH DIRECT VENT APPLICATION
USING EXISTING CHIMNEY
8" - 12"
(203mm - 305mm)
Minimum 12" (305MM)
above chimney top
plate or average snow
accumulation
*SIZE TERMINATION
PIPE PER TABLE 17.
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.
Page 32
12"
(305mm)
5-1/2"
5"
(140mm)
(127mm)
18" MAX.
Front View
(457mm)
EXHAUST VENT
12" (305mm) Min.
above grade or
average snow
INTAKE accumulation.
AIR
Side View
(30G28 or 81J20)
FIGURE 38
FURNACE
EXHAUST
4''
PIPE
GLUE EXHAUST
END FLUSH INTO
TERMINATION
FLAT
1-1/2" ACCELERATOR
SIDE
(
all -45, -070 and -090 units)
FIGURE 39
STRAIGHT-CUT OR
ANGLE-CUT IN DIRECTION
3"-8"
OF ROOF SLOPE *
(76mm-203mm)
EXHAUST VENT
1/2" (13mm)
WEATHERPROOF
INSULATION
SHOULDER OF FITTINGS
INTAKE PIPE
PROVIDE SUPPORT
INSULATION (optional)
OF PIPE ON TOP PLATE
SHEET
METAL TOP
PLATE
3" - 8"
(76mm-
203mm)
INSULATE
TO FORM
SEAL
FIGURE 40
ALTERNATE
INTAKE PIPE
EXTERIOR
PORTION OF
CHIMNEY