51
Table 16 – Maximum Equivalent Vent Length -- Ft. (M)
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.
Single Stage 92%
Unit Size
40,000
Outlet choke
required under 10
ft. TEVL
60,000 80,000 100,000 120,000 140,000
Altitude (feet)
Pipe Dia.
(in)
1½ 2 2½ 1½ 2 2½ 3 1½ 2 2½ 3 4 2 2½ 3 4 2½ 3 4 2½ 3 4
0-2000 20 85 185
20
100 175 200 15 50 130 175 200 20 80 175 200
10
75 185 5 65 155
2001-3000
15
80 175 95 165 185
10
45
125 165 185
15 75
165 185 70 175
N/A
60
140
3001-4000 70 160
15
90 155 175 115 155 175
155
175 5 65 165 120
4001-4500
10
65 155 85
150
170
40 110
150 165
10
70 170
N/A
60
160
50 110
4501-5000 60 145 80 165 145 160
65
150 165 45 100
5001-6000 55 130 75 140 155 35 100 135 150 140 155 155 35 80
6001-7000
5
45 120
10
70 130 145
N/A
30 90
125 140 60 135 145 50 140 30 65
7001-8000 40 110 65 120 135 120 125
N/A
55 125 135 45 130 25 45
8001-9000
N/A
30 95 5 60 115 125 25 80 110 115 50 115 125 40 120 15 30
9001-10000 25 85 N/A 55 105 115 20 75 100 105 45 100 115 30 115 10 15
Meters / MM
Single Stage 92% - Metric
Unit Size
40,000
Outlet choke
required under 10
ft. TEVL
60,000 80,000 100,000 120,000 140,000
Altitude (meters)
Pipe Dia.
(mm)
38 51 64 38 5 64 76 38 51 64 76 102 51 64 76 102 64 76 102 64 76 102
0-610 6 26 57
6.5
31 54 61 2 16 40 54 61 6 25 54 61
3
23 57 1.5 21 48
611-914
4.5
24 53 29 51 57
3
15
38 51 57
5 23
51 57 21 54
N/A
18
42
915-1219 22 49
5
27 48 54 36 48 53
48
54 1.5 20 51 36
1220-1370
3
20 47 26
46
52
13 34
46 51
3
22 52
N/A
19
50
16 33
1371-1524 19 45 24 51 45 50
21
46 51 14 31
1525-1829 17 41 82 43 47 11 31 42 46 43 48 48 11 25
1830-2134
1.5
15 37
3
22 40 44
N/A
10 27
39 42 19 41 45 16 43 9 20
2135-2438 12 34 20 37 42 36 39
N/A
18 38 42 14 40 7 15
2439-2743
N/A
10 30 1.5 19 35 38 8 26 34 36 15 36 39 13 38 5 10
2744-3048 8 26 N/A 17 33 36 7 24 31 33 14 34 36 12 35 3.5 5
Long
Medium
Mitered
Concentric
Standard 2-in., 3-in., or
optional 4-in. termination.
ELBOW CONFIGURATIONS
VENT TERMINAL CONFIGURATIONS
A13110
Table 17 – Deductions from Maximum Equivalent Vent Length -- Ft. (M)
Pipe Diameter (in): 1-1/2 2 2-1/2 3 4
Mitered 90º Elbow 8 (2.4) 8 (2.4) 8 (2.4) 8 (2.4) 8 (2.4)
Medium Radius 90º Elbow 5 (1.5) 5 (1.5) 5 (1.5) 5 (1.5) 5 (1.5)
Long Radius 90º Elbow 3 (0.9) 3 (0.9) 3 (0.9) 3 (0.9) 3 (0.9)
Mitered 45º Elbow 4 (1.2) 4 (1.2) 4 (1.2) 4 (1.2) 4 (1.2)
Medium Radius 45º Elbow 2.5 (0.8) 2.5 (0.8) 2.5 (0.8) 2.5 (0.8) 2.5 (0.8)
Long Radius 45º Elbow 1.5 (0.5) 1.5 (0.5) 1.5 (0.5) 1.5 (0.5) 1.5 (0.5)
Tee 16 (4.9) 16 (4.9) 16 (4.9) 16 (4.9) 16 (4.9)
59SC2C