Haier GE NF96UV Service Manual page 25

Exhaust Pipe
12" Max.
Horizontal
Gas Furnace
NOTE -
ward unit. A minimum of 1/4" (6mm) drop for each 12" (305mm)
of horizontal run is mandatory for drainage.
NOTE - Exhaust pipe MUST be glued to furnace exhaust fittings.
NOTE - Exhaust piping should be checked carefully to make
sure there are no sags or low spots.
Figure 21. Horizontal Installation Offset Requirements
IMPORTANT
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze-ups and
may block the terminations.
Model
All
*Any approved termination may be added to the minimum
length listed.
Table 9. Minimum Vent Pipe Lengths
31-5000726 Rev. 0
12" Min.
Min. Vent Length
15 ft. or
5 ft. plus 2 elbows or
10 ft. plus 1 elbow
Use the following steps to correctly size vent pipe diameter.
Furnace capacity?
1
Which termination?
2
Which needs most
3
elbows?
How many?
4
Desired pipe size?
5
What is the altitude?
6
Use Table 10A
7
through 10C to find
max pipe length.
Page 25
045, 070,
090, 110
or 135 btuh
Standard or
Concentric?
See Table 8
Intake or
Exhaust?
1-1/2", 2",
2-1/2,"
or 3"
Figure 22.