Haier GE NF96UV Service Manual page 30

Maximum Allowable Exhaust Vent Pipe Length
Winter Design
Temperatures ºF Vent Pipe
1
(ºC)
Diameter
1-1/2 in.
32 to 21
2 in.
(0 to -6)
2-1/2 in.
3 in.
1-1/2 in.
2 in.
20 to 1
(-7 to -17)
2-1/2 in.
3 in.
1-1/2 in.
2 in.
0 to -20
(-18 to -29)
2-1/2 in.
3 in.
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 23.
(in ft.) without Insulation in Unconditioned Space for Winter Design
3
045
PVC PP
2
22 N/A
21 18
16 N/A
12 12
12 N/A
11 9
7 N/A
N/A N/A
8 N/A
6 4
N/A N/A
N/A N/A
Conditioned
Space
Figure 23. Insulating Exhaust Pipe in an Unconditioned Space
Temperatures
Unit Input Size
070 090
PVC PP PVC
2
25 N/A N/A
33 30 46
26 N/A 37
21 21 30
20 N/A N/A
19 17 28
14 N/A 21
9 9 16
13 N/A N/A
12 10 19
7 N/A 13
N/A N/A 8
Table 11.
Conditioned
Space
Pipe Insulation
Unconditioned
Space
Page 30
110
PP PVC PP
2 2
N/A N/A N/A
42 30 30
N/A 36 N/A
30 29 29
N/A N/A N/A
25 27 24
N/A 20 N/A
16 14 14
N/A N/A N/A
16 18 15
N/A 12 N/A
8 7 7
Exhaust
Pipe
Intake
Pipe
135
PVC PP
2
N/A N/A
N/A N/A
N/A N/A
42 42
N/A N/A
N/A N/A
N/A N/A
23 23
N/A N/A
N/A N/A
N/A N/A
13 13
31-5000726 Rev. 0