Filter
Top Products
15
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Figure 13
Figure 14
Horizontal Run (in feet)
Vertical Run (in feet)
Measure from the appliance flue collar to the top of the vent pipe
Unacceptable
Venting
Configuration
Vertical Terminations Must
be in this area
Vertical Run (in feet)
Measure from the appliance flue collar to the top of the vent pipe
Horizontal Run (in feet)
May use up to three 90
degree elbows
One 90
degree
elbow
Unacceptable
Venting
Configuration
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 first 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.
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 flue 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 specified in
Figure 3.
Horizontal Termination
Vertical Termination
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
2
3
4
5
6
7
8
9
10
11 12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
2
3
4
5
6
7
8
9
10
11 12
13
14
15
16
17
18
19
20