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Unit Size
Uninsulated
Pipe Dia.
64
76
mm
-7
3.0
15.2
Winter
-18
3.0
6.1
Design
-29
3.0
3.0
Temp
40
3.0
1.5
°C
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.
Unit Size
1 ½
Pipe Dia. (in)
0-2000
20
2001-3000
3001-4000
16
4001-4500
Altitude
4501-5000
15
(feet)
5001-6000
6001-7000
13
7001-8000
10
8001-9000
5
9001-10000
N/A
Unit Size
Pipe Dia.
38
(mm)
0-610
6.0
611-914
0.0
915-1219
4.8
1220-1370
Altitude
1371-1524
(meters)
4.5
1525-1829
1830-2134
3.9
2135-2438
3.0
2439-2743
1.5
2744-3048
NA
NOTES:
1. Inducer Outlet Restrictor disk (P/N 337683-401; 1.25-in. (32 mm) Dia.) 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 ft. (0 to 610 M)above sea level.
2. Inducer Outlet Restrictor disk (P/N 337683-402; 1.50-in. (38 mm) Dia.) 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 ft. (0 to 610 M)above sea level.
120,000 BTUH
3/8in. Insulation
1/2in. Insulation
102
64
76
102
64
12.2
3.0
22.9
28.9
3.0
4.6
3.0
16.8
13.7
3.0
3.0
10.7
7.6
3.0
3.0
7.6
4.6
3.0
Table 16 – Maximum Equivalent Vent Length − Ft.
1
60,000
2 ½
1 ½
2
3
100
175
200
15
55
95
165
185
49
90
155
175
85
150
170
10
44
80
145
165
75
140
155
41
70
130
145
38
65
120
135
36
N/A
60
115
125
33
55
105
115
30
Maximum Equivalent Vent Length - Meters
1
60,000
51
64
76
38
51
30.4
53.3
60.9
4.5
16.7
28.9
50.2
56.3
14.9
27.4
47.2
53.3
0.0
25.9
45.7
51.8
3.0
13.4
24.3
44.1
50.2
22.8
42.6
47.2
12.4
21.3
39.6
44.1
11.5
19.8
36.5
41.1
10.9
NA
18.2
35.0
38.1
10.0
16.7
32.0
35.0
9.1
Uninsulated
76
102
64
76
102
22.9
32.0
1.5
16.7
15.2
19.8
15.2
1.5
7.6
4.6
13.7
9.1
1.5
3.0
1.5
9.1
6.1
1.5
1.5
80,000
2 ½
2
3
4
2
130
175
200
20
125
165
185
15
115
155
175
150
165
110
145
160
10
100
135
150
125
140
90
120
125
80
110
115
N/A
75
100
105
80,000
64
76
102
51
39.6
53.3
60.9
6.0
38.1
50.2
56.3
4.5
35.0
47.2
53.3
45.7
50.2
33.5
44.1
48.7
3.0
30.4
41.1
45.7
38.1
42.6
27.4
36.5
38.1
24.3
33.5
35.0
NA
22.8
30.4
32.0
53
140,000 BTUH
3/8in. Insulation
1/2in. Insulation
64
76
102
64
76
1.5
19.8
32.0
1.5
19.8
1.5
19.8
15.2
1.5
19.8
1.5
13.7
9.1
1.5
15.2
1.5
9.1
6.1
1.5
35
2
100,000
120,000
2 ½
2 ½
3
4
3
80
175
200
75
10
165
185
70
75
175
5
65
155
70
170
150
165
60
65
140
155
60
135
145
50
N/A
55
125
135
46
50
115
125
43
45
100
115
39
2
100,000
120,000
64
76
102
64
76
24.3
53.3
60.9
3.0
22.8
50.2
56.3
0.0
21.3
22.8
53.3
1.5
19.8
47.2
21.3
51.8
45.7
50.2
18.2
19.8
42.6
47.2
18.2
41.1
44.1
15.2
NA
16.7
38.1
41.1
14.0
15.2
35.0
38.1
13.1
13.7
30.4
35.0
11.8
102
38.1
18.3
12.2
7.6
4
185
175
165
160
155
140
130
120
115
102
56.3
53.3
50.2
48.7
47.2
42.6
39.6
36.5
35.0
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