507276-03 Page 19 of 59Issue 1621
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.
NOTE: It is acceptable to use any pipe size which ts within
the guidelines allowed in Table 5.
NOTE: The exhaust collar on all models is sized to
accommodate 2” Schedule 40 vent pipe. In horizontal
applications, transition to exhaust pipe larger than 2” must
be made in vertical runs of the pipe. A 2” elbow must be
added before the pipe is transitioned to any size larger than
2”. This elbow must be added to the elbow count used to
determine acceptable vent lengths. Contact the Application
Department for more information concerning sizing of vent
systems which include multiple pipe sizes.
Figure 23
Figure 24
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze-ups and
may block the terminations.
IMPORTANT
Table 4
*Any approved termination may be added to the minimum length listed.
** This gas furnace must have 3” to 2” reducing elbow ( supplied or
eld replacement Canadian kit) installed directly
MINIMUM VENT PIPE LENGTHS
A95UH1E/95G1UHE
MODELS
MIN.VENT LENGTH*
030,045,070,090,110 15 ft or 5 ft plus 2 elbows or
10 ft plus 1 elbow
135 **
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