Allied A95UH1E - Page 32

507276-03Page 32 of 59 Issue 1621
5. On eld supplied terminations for sidewall exit, exhaust
piping may extend a maximum of 12 inches (305 mm)
for 2” PVC and 20 inches (508 mm) for 3” (76 mm) PVC
beyond the outside wall. Intake piping should be as
short as possible. See Figures 38 and 40.
6. On eld supplied terminations, a minimum distance
between the end of the exhaust pipe and the end of
the intake pipe without a termination elbow is 8” and a
minimum distance of 6” with a termination elbow. See
Figures 38 and 40.
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 every 24” (610 mm) as shown
in Figures 38 and 40. 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 turndown will add 5 feet (1.5 m) 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 44.
Figure 41
Figure 40
See venting Table 5 for maximum venting lengths with this
arrangement.
* Use wall support every 24" (610 mm). Use two wall supports if
extension is greater than 24" (610 mm) but less than 48" (1219 mm).
NOTE − One wall support must be 6" (152 mm) from top of each pipe
(intake and exhaust)
2" (51 mm)
Vent Pipe
3" (76 mm)
Vent Pipe
12" (508 mm) 12" (508 mm)
6" (152 mm) 6" (152 mm)
6" (152 mm)
12" (305 mm) 20" (508 mm)
6" (152 mm) 6" (152 mm
6" (152 mm)
A−Minimum clearance
above grade or average
snow accumulation
B −Maximum horizontal
separation between
intake and exhaust
C −Minimum from
end of exhaust to
inlet of intake
D−Maximum exhaust
pipe length
E −Maximum wall support
distance from top of each
pipe (intake/exhaust)
NOTE − FIELD PROVIDED
REDUCER MAY BE
REQUIRED TO ADAPT
LARGER VENT PIPE SIZE
TO TERMINATION
D
B
C
SIZE TERMINATION
PER TABLE 8
1/2" (13mm) ARMAFLEX
INSULATION IN UN-
CONDITIONED SPACE
STRAIGHT
APPPLICATION
B
C
D
* WALL
SUPPORT
1/2" (13mm) ARMAFLEX INSULATION
IN UNCONDITIONED SPACE (IF REQUIRED)
E
EXTENDED
APPLICATION
A
A
(IF REQUIRED)
Field Supplied Wall Termination