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14 36ARB2 050505-36
ROOF TERMINATION
VENTING CHART
Fig. # 18
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.
A
Minimum rise
B
Pipe length
C
Maximum run
D
Pipe length
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