Deductions From Maximum Equivalent Vent Length - Bryant 912SB Installation, Start-Up, Operating And Service And Maintenance Instructions
Single stage 4-way multipoise condensing gas furnace series b
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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
1
40,000*
60,000
80,000
0 to 2000
100,000
(0 to 610)
120,000
140,000*
40,000*
60,000
80,000
2001 to 3000
100,000
(610 to 914)
120,000
140,000*
40,000*
60,000
80,000
3001 to 4000
100,000
(914 to 1219)
120,000
140,000*
40,000*
60,000
80,000
4001 to 4500
100,000
(1219 to 1370)
120,000
140,000*
* Not all families have these models.
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
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
25
(7.6)
115
30
(9.1)
135
20
(6.1)
70
NA
25
NA
NA
NA
NA
22
(6.7)
105
27
(8.2)
127
17
(5.2)
64
NA
22
NA
NA
NA
NA
18
(5.5)
94
23
(7.0)
119
15
(4.6)
59
NA
19
NA
NA
NA
NA
16
(4.9)
88
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
Vent Pipe Diameter (in.)
2
2-1/2
(35.1)
250
(76.2)
(41.1)
235
(71.6)
(21.3)
175
(53.3)
(7.6)
110
(33.5)
15
(4.6)
10
(3.0)
(32.0)
232
(70.7)
(38.7)
222
(67.7)
(19.5)
165
(50.3)
(6.7)
104
(31.7)
11
(3.4)
NA
(28.7)
214
(65.2)
(36.3)
210
(64.0)
(18.0)
155
(47.2)
(5.8)
98
(29.9)
8
(2.4)
NA
(26.8)
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)
47
3
4
NA
NA
265
(80.8)
NA
235
(71.6)
265
235
(71.6)
265
100
(30.5)
250
90
(27.4)
210
NA
NA
250
(76.2)
NA
222
(67.7)
249
223
(68.0)
250
93
(28.3)
237
80
(24.4)
185
NA
NA
235
(71.6)
NA
210
(64.0)
232
211
(64.3)
236
86
(26.2)
224
79
(24.1)
158
NA
NA
228
(69.5)
NA
202
(61.6)
224
205
(62.5)
229
83
(25.3)
217
69
(21.0)
146
Standard 2-in., 3-in., or
optional 4-in. termination.
3
4
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
(80.8)
(80.8)
(76.2)
(64.0)
(75.9)
(76.2)
(72.2)
(56.4)
(70.7)
(71.9)
(68.3)
(48.2)
(68.3)
(69.8)
(66.1)
(44.5)
A13110
(2.4)
(1.5)
(0.9)
(1.2)
(0.8)
(0.5)
(4.9)
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