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VENTING - HORIZONTAL TERMINATION
One 90-Degree Elbow
C
L
B
A
1’ MIN. RISE
DOESN’T AFFECT
ALLOWABLE (B)
DIMENSION
EXAMPLE VENT RUNS
INITIAL PIPE
LENGTH
A (Vertical)
B (Horizontal)
MAXIMUM
(Dimensions in inches)
12
53
45
24
65
84 (7ft)
36
77
144 (12ft)
48
89
204 (17ft)
Figure 42
NotICE:
Pipe straps must be used every 2 feet to secure venting.
Two 45-Degree Elbows
Installation requirements to replace the first 90-degree elbow with
two 45-degree elbows:
C
L
B
A
1’ MIN. RISE
ELBOWS DO NOT
AFFECT ALLOWABLE
(B) DIMENSION
EXAMPLE VENT RUNS
INITIAL PIPE
LENGTH
A (Vertical)
MINIMUM
B (Horizontal)
MAXIMUM
(Dimensions in inches)
12
57
See Venting Graph
24
69
See Venting Graph
36
81
See Venting Graph
48
93
See Venting Graph
Figure 43
Two 90-Degree Elbows
NotICE:
Subtract 3 feet from the total horizontal measurement for
each 90-degree elbow. Subtract 1-1/2 feet from the total horizontal
measurement for each 45-degree elbow.
B
SUBTRACT 3’
FROM (B)
DOESN’T AFFECT
ALLOWABLE (B)
DIMENSION
A
TO BOTTOM
OF UNIT
EXAMPLE VENT RUNS
INITIAL PIPE
LENGTH
A (Vertical)
B (Horizontal)
MAXIMUM
(Dimensions in inches)
36
77
108 (9ft)
48
89
168 (14ft)
Figure 44
Three 90-Degree Elbows
B
SUBTRACT
3’ FROM (B)
A
TO BOTTOM
OF UNIT
SUBTRACT 3’
FROM (B)
DOESN’T AFFECT
ALLOWABLE (B)
DIMENSION
X
EXAMPLE VENT RUNS
INITIAL PIPE
LENGTH
A (Vertical)
B (Horizontal)
MAXIMUM
(Dimensions in inches)
12
53 + (x)
See Venting Graph
24
65 + (x)
See Venting Graph
36
77 + (x)
See Venting Graph
48
89 + (x)
See Venting Graph
Figure 45
