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Horizontal Termination
The vent must rise vertically, a minimum of 24" (610 mm) off the
top of the appliance for Natural Gas and 36" for Propane Gas before
the fi rst elbow.
The horizontal run may extend up to 20 feet ( 6 meters) and include
a vertical rise of up to 40 feet (12 meters) - see Figure 13. Horizontal
termination must meet the criteria shown in Figures 4 and 5.
• Approved vent systems must terminate above and including the
heavy line in Figure 13.
• Two 45 degree elbows may be substituted for each single 90 degree
elbow.
• With a rise between 2 feet to 5 feet, one 90 degree or two 45 degree
elbows may be used.
40
39
38
37
36
35
34
33
32
31
May use up to three 90
30
degree elbows
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
10
9
8
7
6
One 90
5
degree
4
3
elbow
2
1
0
1
2
3 4
5
6
7 8
Figure 13
Horizontal Run (in feet)
Unacceptable
Venting
Confi guration
9 10 11 12 13 14 15 16 17 18 19 20
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Vertical Termination
A vertical vent system must terminate no less than 8 feet ( 2.44 meters)
and no more than 40 feet / 12 meters ( above the appliance fl ue collar.
See Figure 14.
A vertically terminated vent system must also conform to the follow-
ing criteria:
No more than three 90 degree elbows may be used.
Two 45 degree elbows may be substituted for one 90 degree elbow. No
more than six 45 degree elbows may be used.
Vent must rise a minimum of 2 feet before an offset is used.
Termination height must conform to roof clearance as specifi ed in
Figure 3.
40
39
38
37
36
35
34
33
32
31
Vertical Terminations Must
30
be in this area
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
10
9
8
7
6
5
4
3
2
1
0
1
2
3 4
5
6
Figure 14
Horizontal Run (in feet)
Unacceptable
Venting
Confi guration
9 10 11 12 13 14 15 16 17 18 19 20
7 8
11
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