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ROOF TERMINATION
VENTING CHART
Fig. # 18
Minimum
2' Length
of Pipe
N
OTE: The vent must not exceed a total length of 6
8
feet. Any
combination of rise and run may be used but must be constrained
to the boundaries of this chart. A total of 4 90° elbows or combina-
tion of other elbows equalling 90° can be used without reducing
horizontal run. For each additional 90° elbow, or an equal com-
bination of elbows, reduce horizontal vent run by 2 feet. Ensure
vent pipe is properly supported.
A
Minimum rise
B
Pipe length
C
Maximum run
D
Pipe length
Maximum
74 1/4”
24”
1
8
"
1'
8
0 1/4”
30”
7
8
1/
8
"
5'
8
6 1/4”
36”
11' 6 1/4"
10'
92 1/4”
42”
16' 6 1/2"
15'
9
8
1/4”
4
8
”
21’ 6 5/
8
”
20'
For other rise/run combinations see chart below
