ROOF TERMINATION
Fig. # 18
VENTING CHART
A | B | C | D | |
Pipe length | ||||
Minimum rise | Pipe length | Maximum run | ||
Maximum | ||||
|
|
| ||
68 1/2” | 24” | 26 5/16" | 1' | |
|
|
|
| |
74 1/2” | 30” | 84 3/8" | 5' | |
|
|
|
| |
80 1/2” | 36” | 11' 10 1/2" | 10' | |
|
|
|
| |
86 1/2” | 42” | 16' 8 1/2" | 15' | |
|
|
|
| |
92 1/2” | 48” | 21’ 6 5/8” | 20' | |
|
|
|
|
For other rise/run combinations see chart below
24" Pipe length minimum
14 36ARB2
NOTE: The vent must not exceed a total length of 68 feet. Any combination of rise and run may be used but must be con- strained to the boundaries of this chart. A total of 4 90° elbows or combination of other elbows equalling 90° can be used without reducing horizontal run. For each additional 90° elbow, or an equal combination of elbows, reduce horizontal vent run by 2 feet. Ensure vent pipe is properly supported.
