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NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows.
Use Table 17 - Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application.
2
Unit Size
26,000
Pipe Dia. (in)
1 ½
2
0--- 2000
70
200
2001--- 3000
65
190
3001--- 4000
60
175
4001--- 4500
55
160
Altitude
4501--- 5000
(feet)
5001--- 6000
50
145
6001--- 7000
45
135
7001--- 8000
40
120
8001--- 9000
35
110
9001--- 10000
30
95
2
Unit Size
26,000
Pipe Dia.
38
51
(mm)
0--- 610
21.3
60.9
611--- 914
19.8
57.9
915--- 1219
18.2
53.3
1220--- 1370
Altitude
16.7
48.7
(meters)
1371--- 1524
1525--- 1829
15.2
44.1
1830--- 2134
13.7
41.1
2135--- 2438
12.1
36.5
2439--- 2743
10.6
33.5
2744--- 3048
9.1
28.9
NOTES:
1. Inducer Outlet Restrictor disk (P/N 337683 ---401; 1.25 ---in. (32 mm) Dia.) shipped in the loose parts bag or available through Replacement Components
required under 10 ---ft. (3 M) TEVL in all orientations. Required for installations from 0 --- 2000 (0 to 610 M) above sea level. Failure to use an outlet restric-
tor may result in flame disturbances or flame sense lock ---out.
2. Inducer Outlet Restrictor disk (P/N 337683 ---401; 1.25 ---in. (32 mm) Dia.) shipped in the loose parts bag or available through Replacement Components
required for no greater than 5 ---ft. (1.5 M) TEVL in downflow and horizontal orientations only. Required for installations from 0 --- 2000 (0 to 610 M) above
sea level.
ELBOW CONFIGURATIONS
Long
Medium
Pipe Diameter (in):
Mitered 90º Elbow
Medium Radius 90º Elbow
Long Radius 90º Elbow
Mitered 45º Elbow
Medium Radius 45º Elbow
Long Radius 45º Elbow
Tee
Concentric Vent Termination
Standard Vent Termination
NOTES:
1. Use only the smallest diameter pipe possible for venting. Over ---sizing may cause flame disturbance or excessive vent terminal icing or freeze ---up.
2. NA --- Not allowed. Pressure switch will not close, or flame disturbance may result.
3. Vent sizing for Canadian installations over 4500 ft. (1370 M) above sea level are subject to acceptance by the local authorities having jurisdiction.
4. Size both the combustion air and vent pipe independently, then use the larger size for both pipes.
5. Assume the two 45_ elbows equal one 90_ elbow. Wide radius elbows are desirable and may be required in some cases.
6. Elbow and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
7. The minimum pipe length is 5 ft. (2 M) linear feet (meters) for all applications.
8. Use 3 ---in. (76 mm) diameter vent termination kit for installations requiring 4 ---in. (102 mm) diameter pipe.
Table 16 – Maximum Equivalent Vent Length - - Ft.
1
2
40,000
60,000
1 ½
2
2 ½
1 ½
2
2 ½
40
155
185
100
175
20
35
150
175
95
165
30
135
160
16
90
155
130
155
85
150
25
125
145
15
80
145
20
120
130
75
140
15
110
120
13
70
130
100
110
10
65
120
10
90
95
5
60
115
5
80
85
N/A
55
105
Maximum Equivalent Vent Length --- Meters
1
2
40,000
60,000
38
51
64
38
51
64
12.1
47.2
56.3
30.4
53.3
6.0
10.6
45.7
53.3
28.9
50.2
9.1
41.1
48.7
4.8
27.4
47.2
39.6
47.2
25.9
45.7
7.6
38.1
44.1
4.5
24.3
44.1
6.0
36.5
39.6
22.8
42.6
4.5
33.5
36.5
3.9
21.3
39.6
30.4
33.5
3.0
19.8
36.5
3.0
27.4
28.9
1.5
18.2
35.0
1.5
24.3
25.9
NA
16.7
32.0
Mitered
Table 17 – Deductions from Maximum Equivalent Vent Length - - Ft. (M)
1-1/2
8
(2.4)
5
(1.5)
3
(0.9)
4
(1.2)
2.5
(0.8)
1.5
(0.5)
16
(4.9)
NA
0
(0.0)
80,000
3
1 ½
2
2 ½
3
4
200
15
55
130
175
200
185
125
165
185
49
175
115
155
175
170
10
150
165
44
110
165
145
160
155
41
100
135
150
145
38
125
140
90
135
36
120
125
N/A
125
33
80
110
115
115
30
75
100
105
80,000
76
38
51
64
76
102
60.9
4.5
16.7
39.6
53.3
60.9
56.3
38.1
50.2
56.3
14.9
53.3
35.0
47.2
53.3
51.8
3.0
45.7
50.2
13.4
33.5
50.2
44.1
48.7
47.2
12.4
30.4
41.1
45.7
44.1
11.5
38.1
42.6
27.4
41.1
10.9
36.5
38.1
NA
38.1
10.0
24.3
33.5
35.0
35.0
9.1
22.8
30.4
32.0
VENT TERMINAL CONFIGURATIONS
Concentric
2
2-1/2
8
(2.4)
8
5
(1.5)
5
3
(0.9)
3
4
(1.2)
4
2.5
(0.8)
2.5
1.5
(0.5)
1.5
16
(4.9)
16
0
(0.0)
NA
0
(0.0)
0
51
100,000
120,000
2
2 ½
3
4
2 ½
3
20
80
175
200
75
10
165
185
70
15
75
175
5
65
155
70
170
150
165
60
10
65
140
155
60
135
145
N/A
50
55
125
135
46
N/A
50
115
125
43
45
100
115
39
100,000
120,000
51
64
76
102
64
76
6.0
24.3
53.3
60.9
22.8
3.0
50.2
56.3
21.3
4.5
22.8
53.3
1.5
19.8
47.2
21.3
51.8
45.7
50.2
18.2
3.0
19.8
42.6
47.2
18.2
41.1
44.1
NA
15.2
16.7
38.1
41.1
14.0
NA
15.2
35.0
38.1
13.1
13.7
30.4
35.0
11.8
Standard 2-in., 3-in., or
optional 4-in. termination.
3
(2.4)
8
(2.4)
(1.5)
5
(1.5)
(0.9)
3
(0.9)
(1.2)
4
(1.2)
(0.8)
2.5
(0.8)
(0.5)
1.5
(0.5)
(4.9)
16
(4.9)
0
(0.0)
(0.0)
0
(0.0)
140,000
4
2 ½
3
4
185
5
65
155
175
140
60
165
120
50
110
160
45
100
155
N/A
35
80
140
30
65
130
25
45
120
15
30
115
10
15
140,000
102
64
76
102
56.3
1.5
19.8
47.2
53.3
42.6
18.2
50.2
36.5
15.2
33.5
48.7
13.7
30.4
47.2
NA
10.6
24.3
42.6
9.1
19.8
39.6
7.6
13.7
36.5
4.5
9.1
35.0
3.0
4.5
A13110
4
8
(2.4)
5
(1.5)
3
(0.9)
4
(1.2)
2.5
(0.8)
1.5
(0.5)
16
(4.9)
NA
0
(0.0)
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