507270-03 Page 31 of 60Issue 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 36 and 38.
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 36 and 38.
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 36 and 38. When exhaust
and intake piping must be run up an 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 42.
Figure 39
Figure 38
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