Lennox SIGNATURE SLP99UHV Installation Instructions Manual page 24

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 37, 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 7.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 - Based on the recommendation of the manufacturer,
a multiple furnace installation may use a group
of up to four terminations assembled together
horizontally, as shown in FIGURE 35.
12" (305mm)
Minimum
Above Average
Snow
Accumulation
CLAMP
DIRECT VENT CONCENTRIC ROOFTOP TERMINATION
71M80, 69M29 or 60L46 (US)
44W92 or 44W93 (Canada)
FIGURE 33
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 34
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 24
12"
(305mm)
5-1/2"
5"
(140mm)
(127mm)
18" MAX. Front View
(457mm)
EXHAUST VENT
12" (305mm) Min.
above grade or
INTAKE
cumulation.
AIR
Side View
(30G28 or 81J20)
FIGURE 35
FURNACE
EXHAUST
4''
PIPE
GLUE EXHAUST
END FLUSH INTO
TERMINATION
FLAT
1-1/2" ACCELERATOR
SIDE
FIGURE 36