507769-04
Page 17 of 53
Issue 1927
Figure 22. Typical Exhaust Pipe Connections
Pipe size determined in table 7.
2”
TOP VIEW
EXHAUST
INTAKE
2”
2”
2”
2”
or
TRANSITION
3”
*2”
*2”
1-1/2”
or
TRANSITION
NOTE
: 1-1/2” Vent Pipe
Diameter Allowed Only
on 045/070 Units
DO NOT transition
from larger to smaller
pipe in horizontal runs
of
exhaust pipe
.
DO NOT transition
from smaller to larger
pipe in horizontal runs
of
exhaust pipe
.
* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.
NOTE
: Exhaust pipe and intake pipe must be the same diameter.
Maximum Allowable Exhaust Vent Lengths with Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl
Space for Intake Air in Feet
Standard Termination at Elevation 0 − 10,000 ft.
Number of
90
°
Elbows
Used
1-1/2” Pipe
2” Pipe
2-1/2” Pipe
3” Pipe
Capacity
Capacity
Capacity
Capacity
045
070
090
045
070
090
045
070
090
045
070
090
1
10
10
n/a
61
46
24
100
80
43
127
127
108
2
n/a
n/a
56
41
19
95
75
38
122
122
103
3
51
36
14
90
70
33
117
117
98
4
46
31
n/a
85
65
28
112
112
93
5
41
26
80
60
23
107
107
88
6
36
21
75
55
18
102
102
83
7
31
16
70
50
13
97
97
78
8
26
11
65
45
n/a
92
92
73
9
21
n/a
60
40
87
87
68
10
16
55
35
82
82
63
NOTE
: Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation.
Table 8.
Содержание 96G1DFE
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