54
Maximum Allowable Exposed Vent Length in Unconditioned Space -- Meters (continued)
Winter
Design
Temp
°C
Unit Size
120,000 BTUH
140,000 BTUH
Uninsulated
3/8-in. Insulation
1/2-in. Insulation
Uninsulated
3/8-in. Insulation
1/2-in. Insulation
Pipe Dia.
mm
64
76
102
64
76
102
64
76
102
64
76
102
64
76
102
64
76
102
-7
3.0
15.2
12.2
3.0
22.9
28.9
3.0
22.9
32.0
1.5
16.7
15.2
1.5
19.8
32.0
1.5
19.8
38.1
-18
3.0
6.1
4.6
3.0
16.8
13.7
3.0
19.8
15.2
1.5
7.6
4.6
1.5
19.8
15.2
1.5
19.8
18.3
-29
3.0
3.0
3.0
10.7
7.6
3.0
13.7
9.1
1.5
3.0
1.5
1.5
13.7
9.1
1.5
15.2
12.2
-40
3.0
1.5
3.0
7.6
4.6
3.0
9.1
6.1
1.5
1.5
1.5
9.1
6.1
1.5
35
7.6
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.
Table 16 – Maximum Equivalent Vent Length -- Ft.
Unit Size
60,000
1
80,000
100,000
2
120,000
Altitude
(feet)
Pipe Dia. (in)
1 ½
2
2 ½
3
1 ½
2
2 ½
3
4
2
2 ½
3
4
2 ½
3
4
0---2000
20
100
175
200
15
55
130
175
200
20
80
175
200
10
75
185
2001---3000
95
165
185
10
49
125
165
185
15
75
165
185
70
175
3001---4000
16
90
155
175
115
155
175
155
175
5
65
165
4001---4500
15
85
150
170
44
110
150
165
10
70
170
N/A
60
160
4501---5000
80
145
165
145
160
65
150
165
5001---6000
75
140
155
41
100
135
150
140
155
155
6001---7000
13
70
130
145
N/A
38
90
125
140
60
135
145
50
140
7001---8000
10
65
120
135
36
120
125
N/A
55
125
135
46
130
8001---9000
5
60
115
125
33
80
110
115
50
115
125
43
120
9001---10000
N/A
55
105
115
30
75
100
105
45
100
115
39
115
Maximum Equivalent Vent Length --- Meters
Unit Size
60,000
1
80,000
100,000
2
120,000
Altitude
(meters)
Pipe Dia.
(mm)
38
51
64
76
38
51
64
76
102
51
64
76
102
64
76
102
0---610
6.0
30.4
53.3
60.9
4.5
16.7
39.6
53.3
60.9
6.0
24.3
53.3
60.9
3.0
22.8
56.3
611---914
0.0
28.9
50.2
56.3
3.0
14.9
38.1
50.2
56.3
4.5
22.8
50.2
56.3
0.0
21.3
53.3
915---1219
4.8
27.4
47.2
53.3
0.0
35.0
47.2
53.3
47.2
53.3
1.5
19.8
50.2
1220---1370
4.5
25.9
45.7
51.8
13.4
33.5
45.7
50.2
3.0
21.3
51.8
NA
18.2
48.7
1371---1524
24.3
44.1
50.2
44.1
48.7
19.8
45.7
50.2
1525---1829
22.8
42.6
47.2
12.4
30.4
41.1
45.7
42.6
47.2
47.2
1830---2134
3.9
21.3
39.6
44.1
NA
11.5
27.4
38.1
42.6
18.2
41.1
44.1
15.2
42.6
2135---2438
3.0
19.8
36.5
41.1
10.9
36.5
38.1
NA
16.7
38.1
41.1
14.0
39.6
2439---2743
1.5
18.2
35.0
38.1
10.0
24.3
33.5
35.0
15.2
35.0
38.1
13.1
36.5
2744---3048
NA
16.7
32.0
35.0
9.1
22.8
30.4
32.0
13.7
30.4
35.0
11.8
35.0
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.