Haier GE NF96DV Service Manual page 28

96% downflow two stage variable speed gas furnace
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Maximum Allowable Exhaust Vent Pipe Length
Winter Design
Temperatures
ºF (ºC)
1
32 to 21
(0 to -6)
20 to 1
(-7 to -17)
0 to -20
(-18 to -29)
Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.
1
Poly-Propylene vent pipe (PP) by Duravent and Centrotherm
2
Vent length in table is equivalent length. Each elbow is equivalent to 5ft of straight pipe and should be included when measuring
3
total length.
NOTE - Concentric terminations are the equivalent of 5' and should be considered when measuring pipe length.
NOTE- Maximum uninsulated vent lengths listed may include the termination (vent pipe exterior to the structure ) and cannot exceed
5 linear feet or the maximum allowable intake or exhaust vent length listed in Table 10A through Table 10C.
NOTE - If insulation is required in an unconditioned space, it must be located on the pipe closest to the furnace. See Figure 21.
(in ft.) without Insulation in Unconditioned Space for Winter Design
3
Vent Pipe
045
Diameter
PVC
1-1/2 in.
20
2 in.
33
2-1/2 in.
26
3 in.
21
1-1/2 in.
20
2 in.
19
2-1/2 in.
14
3 in.
9
1-1/2 in.
13
2 in.
12
2-1/2 in.
7
3 in.
N/A
Conditioned
Space
Figure 21. Insulating Exhaust Pipe in an Unconditioned Space
Temperatures
Unit Input Size
070
PP
PVC
2
N/A
N/A
30
46
N/A
37
21
30
N/A
N/A
17
28
N/A
21
9
16
N/A
N/A
10
19
N/A
13
N/A
8
Table 11.
Conditioned
Space
Pipe Insulation
Unconditioned
Space
Page 28
090
PP
PVC
2
N/A
N/A
42
30
N/A
36
30
29
N/A
N/A
25
27
N/A
20
16
14
N/A
N/A
16
18
N/A
12
8
7
Exhaust
Pipe
Intake
Pipe
PP
2
N/A
30
N/A
29
N/A
24
N/A
14
N/A
15
N/A
7
31-5000727 Rev. 0

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