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Maximum Allowable Exhaust Vent Length Using Ventilated Attic or Crawl Space for Intake Air in Feet
1-1/2" Pipe
Number of
Capacity
90° Elbows
Used
070
1
2
3
4
5
n/a
6
7
8
9
10
NOTE: Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length
calculation.
Page 20 of 53
Standard Termination at Elevation 0 - 10,000 ft
090
110
070
41
36
31
26
21
n/a
n/a
16
11
6
1
n/a
Pipe size determined in table 7.
2"
2"
2"
2"
or
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.
Figure 23. Typical Exhaust Pipe Connections
2" Pipe
Capacity
090
110
070
24
85
19
80
14
75
9
70
4
65
n/a
60
55
n/a
50
45
40
Table 7C.
2"
3"
TRANSITION
*2"
DO NOT transition
from larger to smaller
pipe in horizontal runs
of exhaust pipe.
Issue 2341
2-1/2" Pipe
Capacity
090
110
070
63
28
102
58
23
97
53
18
92
48
13
87
43
8
82
38
3
77
33
72
28
67
n/a
23
62
18
57
NOTE: 1-1/2" Vent Pipe
Diameter Allowed Only
on 045/070 Units
1-1/2"
or
TRANSITION
*2"
INTAKE
3" Pipe
Capacity
090
110
83
83
78
78
73
73
68
68
63
63
58
58
53
53
48
48
43
43
38
38
EXHAUST
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