Lennox SLP99UHV Series Unit Information page 56

3"(76mm) MAX.
Inches(mm)
8" (203mm) MIN
12" (305mm) ABOVE
AVERAGE SNOW
ACCUMULATION
3" (76mm) OR
2" (51mm) PVC
PROVIDE SUPPORT
FOR INTAKE AND
EXHAUST LINES
DIRECT VENT ROOF TERMINATION KIT
(15F75 or 44J41)
FIGURE 30
Exiting Exhaust and Intake Vent
(different pressure zone)
Exhaust
Pipe
FIGURE 31
UNCONDITIONED
ATTIC SPACE
Inlet Air
Furnace
(Minimum 12 in.
305 MM) above
grade or snow
accumulation
Exiting Exhaust and Intake Vent
(different pressure zone)
Roof T erminated
Exhaust Pipe
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 33, 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 26.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 pip
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 36.
Page 56
Inlet Air
(Minimum 12 in.
Furnace
305 MM) above
grade or snow
accumulation
FIGURE 32