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NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows.
Use Table 16 - Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application.
Unit Size
BTU/Hr
Altitude
FT (M)
3
40,000
60,000
80,000
0 to 2000
100,000
(0 to 610)
120,000
4
140,000
40,000
60,000
80,000
2001 to 3000
100,000
(610 to 914)
120,000
4
140,000
40,000
60,000
80,000
3001 to 4000
100,000
(914 to 1219)
120,000
4
140,000
40,000
60,000
4001 to 4500
80,000
(1219 to
100,000
1370)
120,000
4
140,000
NOTES: See notes at end of venting tables.
See Table 17 for altitudes over 4500 ft. (1370 M)
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
Table 15 – Maximum Equivalent Vent Length - - Ft. (M)
0 to 4500 Ft. (0 to 1370 M) Altitude
DIRECT VENT (2-PIPE) AND NON-DIRECT VENT (1-PIPE)
1-1/2
50
(15.2)
210
30
(9.1)
135
20
(6.1)
70
NA
25
NA
NA
NA
NA
45
(13.7)
198
27
(8.2)
127
17
(5.2)
64
NA
22
NA
NA
NA
NA
39
(11.9)
184
23
(7.0)
119
15
(4.6)
59
NA
19
NA
NA
NA
NA
36
(11.0)
177
21
(6.4)
115
14
(4.3)
56
NA
17
NA
NA
NA
NA
Mitered
Table 16 – Deductions from Maximum Equivalent Vent Length - - Ft. (M)
1-1/2
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
NA
0
0
(0.0)
0
Vent Pipe Diameter (in.)
2
2-1/2
(64.0)
250
(76.2)
(41.1)
235
(71.6)
(21.3)
175
(53.3)
(7.6)
110
(33.5)
15
(4.6)
10
(3.0)
(60.4)
232
(70.7)
(38.7)
222
(67.7)
(19.5)
165
(50.3)
(6.7)
104
(31.7)
11
(3.4)
NA
(56.1)
214
(65.2)
(36.3)
210
(64.0)
(18.0)
155
(47.2)
(5.8)
98
(29.9)
8
(2.4)
NA
(53.9)
205
(62.5)
(35.1)
204
(62.2)
(17.1)
150
(45.7)
(5.2)
94
(28.7)
NA
NA
VENT TERMINAL CONFIGURATIONS
Concentric
2
2-1/2
(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)
NA
(0.0)
0
(0.0)
47
1
3
4
2
NA
NA
265
(80.8)
NA
235
(71.6)
265
(80.8)
235
(71.6)
265
(80.8)
100
(30.5)
250
(76.2)
90
(27.4)
210
(64.0)
NA
NA
250
(76.2)
NA
222
(67.7)
249
(75.9)
223
(68.0)
250
(76.2)
93
(28.3)
237
(72.2)
80
(24.4)
185
(56.4)
NA
NA
235
(71.6)
NA
210
(64.0)
232
(70.7)
211
(64.3)
236
(71.9)
86
(26.2)
224
(68.3)
79
(24.1)
158
(48.2)
NA
NA
228
(69.5)
NA
202
(61.6)
224
(68.3)
205
(62.5)
229
(69.8)
83
(25.3)
217
(66.1)
69
(21.0)
146
(44.5)
Standard
3
4
8
(2.4)
8
(2.4)
5
(1.5)
5
(1.5)
3
(0.9)
3
(0.9)
4
(1.2)
4
(1.2)
2.5
(0.8)
2.5
(0.8)
1.5
(0.5)
1.5
(0.5)
16
(4.9)
16
(4.9)
0
(0.0)
NA
0
(0.0)
0
(0.0)
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