Maximum Equivalent Vent Length; Deductions From Maximum Equivalent Vent Length - Bryant 987MA Installation, Start-Up, Operating And Service And Maintenance Instructions
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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.
Altitude
Unit Size
FT (M)
BTU/Hr
60,000
80,000
0 to 2000
(0 to 610)
100,000
120,000
60,000
80,000
2001 to 3000
(610 to 914)
100,000
120,000
60,000
80,000
3001 to 4000
(914 to 1219)
100,000
120,000
60,000
80,000
4001 to 4500
(1219 to 1370)
100,000
120,000
* 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 VENTILATED COMBUSTION AIR ONLY
1-1/2
55
(16.8)
135
35
(10.7)
130
NA
50
NA
45
(13.7)
127
30
(9.1)
90
NA
40
NA
40
(12.2)
119
25
(7.6)
85
NA
40
NA
35
(10.7)
115
23
(7.0)
85
NA
40
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
(41.1)
235
(71.6)
(39.6)
175
(53.3)
(15.2)
110
(33.5)
NA
15
(4.6)
(38.7)
222
(67.7)
(27.4)
165
(50.3)
(12.2)
104
(31.7)
NA
11
(3.4)
(36.3)
210
(64.0)
(25.9)
155
(47.2)
(12.2)
98
(29.9)
NA
8
(2.4)
(35.1)
204
(62.2)
(25.9)
150
(45.7)
(12.2)
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)
50
3
4
265
(80.8)
NA
235
(71.6)
265
(80.8)
235
(71.6)
265
(80.8)
100
(30.5)
250
(76.2)
250
(76.2)
NA
222
(67.7)
249
(75.9)
223
(68.0)
250
(76.2)
93
(28.3)
237
(72.2)
235
(71.6)
NA
210
(64.0)
232
(70.7)
211
(64.3)
236
(71.9)
86
(26.2)
224
(68.3)
228
(69.5)
NA
202
(61.6)
224
(68.3)
205
(62.5)
229
(69.8)
83
(25.3)
217
(66.1)
Standard 2-in., 3-in., or
optional 4-in. termination.
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)
A13110
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