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The exhaust vent pipe operates under positive pressure
and must be completely sealed to prevent leakage of
combustion products into the living space.
Vent Piping Guidelines
This gas furnace can be installed as either a Non-Direct
Vent or a Direct Vent gas central furnace.
NOTE: In non-Direct Vent installations, combustion air is
taken from indoors and flue gases are discharged outdoors.
In Direct Vent installations, combustion air is taken from
outdoors and flue gases are discharged outdoors.
Intake and exhaust pipe sizing - Size pipe according
to Tables 6 and 7. Table 6 lists the minimum vent pipe
lengths permitted. Table 7A - 7C lists the maximum pipe
lengths permitted.
Regardless of the diameter of pipe used, the standard roof
and wall terminations described in section Exhaust Piping
Terminations should be used. Exhaust vent termination
pipe is sized to optimize the velocity of the exhaust gas as
it exits the termination.
MINIMUM VENT PIPE LENGTHS
A96DF2E
MODELS
045,070,090,110
*Any approved termination may be added to the minimm length listed.
Page 16 of 59
CAUTION
MIN.VENT LENGTH*
15 ft or 5 ft plus 2 elbows or
10 ft plus 1 elbow
Table 6
Use the following steps to correctly size vent pipe diameter.
In some applications which permit the use of several different
sizes of vent pipe, a combination vent pipe may be used.
Contact Allied Air Technical Service for assistance in sizing
vent pipe in these applications.
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze-ups and
may block the terminations.
Issue 1621
Figure 21
IMPORTANT
507582-02
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