507405-05Page 16 of 72 Issue 1621
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze-ups and
may block the terminations.
IMPORTANT
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.
Table 6
Use the following steps to correctly size vent pipe diameter.
Figure 21
1
2
3
4
5
6
045, 070,
090, 110
Which termination?
Standard or
Concentric?
See Table 5
Intake or
exhaust
Which needs
most elbows?
How many?
2", 2 1/2"
or 3"
Desired pipe size?
Use Table 7 to nd
max intake or exhaust
pipe length.
What is the altitude?
7
Furnace capacity?
MINIMUM VENT PIPE LENGTHS
A96DF2V MIN. VENT LENGTH*
045, 070, 090, 110
15 ft. or
5 ft plus 2 elbows
or 10 ft plus 1 elbow
* Any approved termination may be added to the minimum lengh listed.
To Next Page
Loading...