Lennox SLP98UHV Installation Instructions Manual page 21

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 29, 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 27.
12" (305mm)
Minimum
Above Average
Snow
Accumulation
CLAMP
DIRECT VENT CONCENTRIC ROOFTOP TERMINATION
71M80, 69M29 or 60L46 (US)
44W92 or 44W93 (Canada)
FIGURE 25
FIELD-PROVIDED
QUIRED TO ADAPT
LARGER VENT PIPE
SIZE TO TERMINATION.
OUTSIDE
WALL
EXHAUST
AIR
INTAKE
CLAMP
AIR
(Not Furnished)
DIRECT VENT CONCENTRIC WALL TERMINATION
71M80, 69M29 or 60L46 (US)
41W92 or 41W93 (Canada)
FIGURE 26
FLASHING
INTAKE
(Not Furnished)
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
INTAKE
AIR
EXHAUST
AIR
12" (305mm) Min.
INTAKE
above grade or
AIR
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 21
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 27
FURNACE
EXHAUST
4''
PIPE
GLUE EXHAUST
END FLUSH INTO
TERMINATION
FLAT
1-1/2" ACCELERATOR
SIDE
FIGURE 28