Bryant 912SB Installation, Start-Up, Operating And Service And Maintenance Instructions page 46

Table 14 – Maximum Allowable Exposed Vent Lengths Insulation Table - - Ft. / M
Single Winter
Pipe
Stage Design
Length in
Furnace Temp
Ft. & M
Input °F (°C)
20 (-10)
0 (-20)
40,000*
20 (-30)
-40 (-40)
20 (-10)
0 (-20)
60,000
-20 (-30)
-40 (-40)
20 (-10)
0 (-20)
80,000
-20 (-30)
-40 (-40)
20 (-10)
0 (-20)
100,000
-20 (-30)
-40 (-40)
20 (-10)
0 (-20)
120,000
-20 (-30)
-40 (-40)
20 (-10)
0 (-20)
140,000*
-20 (-30)
-40 (-40)
Not all families have these models.
Maximum Length of Uninsulated and Insulated Vent Pipe-Ft (M)
No Insulation
Pipe Diameter --- in. (mm)
1 1/2 2 2 1/2 3
(38) (51) (64) (76)
FT 25 42 42 N/A
M 7.6 12.8 12.8 N/A
FT 25 19 17 N/A
M 7.6 5.8 5.2 N/A
FT 14 7 5 N/A
M 4.3 2.1 1.5 N/A
FT 7 0 0 N/A
M 2.1 0.0 0.0 N/A
Ft. 30 61 61 54
M 9.1 18.6 18.6 16.5
Ft. 30 31 30 23
M 9.1 9.4 9.1 7.0
Ft. 24 17 15 7
M 7.3 5.2 4.6 2.1
Ft. 15 8 5 0
M 4.6 2.4 1.5 0.0
Ft. 20 70 78 70
M 6.1 21.3 23.8 21.3 18.3
Ft. 20 42 41 33
M 6.1 12.8 12.5 10.1
Ft. 20 25 23 14
M 6.1 7.6 7.0 4.3
Ft. 20 14 12 3
M 6.1 4.3 3.7 0.9
Ft. N/A 25 99 89
M N/A 7.6 30.2 27.1 23.8
Ft. N/A 25 55 46
M N/A 7.6 16.8 14.0 10.1
Ft. N/A 25 34 24
M N/A 7.6 10.4 7.3
Ft. N/A 23 20 11
M N/A 7.0 6.1 3.4
Ft. N/A N/A 15 99
M N/A N/A 4.6 30.2 26.2
Ft. N/A N/A 15 51
M N/A N/A 4.6 15.5 11.6
Ft. N/A N/A 15 28
M N/A N/A 4.6 8.5
Ft. N/A N/A 15 14
M N/A N/A 4.6 4.3
Ft. N/A N/A 10 90
M N/A N/A 3.0 27.4 30.2
Ft. N/A N/A 10 61
M N/A N/A 3.0 18.6 14.3
Ft. N/A N/A 10 35
M N/A N/A 3.0 10.7
Ft. N/A N/A 10 20
M N/A N/A 3.0 6.1
3/8-in. (9.5 mm) Insulation
Pipe Diameter --- in. (mm)
4 1 1/2 2 2 1/2 3
(102) (38) (51) (64) (76)
N/A 25 115 111 N/A
N/A 7.6 35.1 33.8 N/A
N/A 25 75 66 N/A
N/A 7.6 22.9 20.1 N/A
N/A 65 52 45 N/A
N/A 19.8 15.8 13.7 N/A
N/A 49 38 31 N/A
N/A 14.9 11.6 9.4 N/A
N/A 30 135 163 142
N/A 9.1 41.1 49.7 43.3
N/A 30 113 100 85
N/A 9.1 34.4 30.5 25.9
N/A 30 81 70 57
N/A 9.1 24.7 21.3 17.4
N/A 30 61 52 40
N/A 9.1 18.6 15.8 12.2
60 20 70 175 183
6.1 21.3 53.3 55.8
21 20 70 132 111
6.4 6.1 21.3 40.2 33.8
1 20 70 94 77
0.3 6.1 21.3 28.7 23.5
0 20 70 71 56
0.0 6.1 21.3 21.6 17.1
78 N/A 25 110 233
N/A 7.6 33.5 71.0
33 N/A 25 110 145
N/A 7.6 33.5 44.2
11 N/A 25 110 103
3.4 N/A 7.6 33.5 31.4
0 N/A 25 95 77
0.0 N/A 7.6 29.0 23.5
86 N/A N/A 15 100
N/A N/A 4.6 30.5
38 N/A N/A 15 100
N/A N/A 4.6 30.5
14 N/A N/A 15 100
4.3 N/A N/A 4.6 30.5
0 N/A N/A 15 85
0.0 N/A N/A 4.6 25.9
99 N/A N/A 10 90
N/A N/A 3.0 27.4
47 N/A N/A 10 90
N/A N/A 3.0 27.4
21 N/A N/A 10 90
6.4 N/A N/A 3.0 27.4
NA N/A N/A 10 90
NA N/A N/A 3.0 27.4
46
1/2-in. (12.7 mm) Insulation
Pipe Diameter --- in. (mm)
4 1 1/2 2 2 1/2 3
(102) (38) (51) (64) (76)
N/A 25 115 130 N/A
N/A 7.6 35.1 39.6 N/A
N/A 25 90 79 N/A
N/A 7.6 27.4 24.1 N/A
N/A 25 64 55 N/A
N/A 7.6 19.5 16.8 N/A
N/A 25 48 40 N/A
N/A 7.6 14.6 12.2 N/A
N/A 30 135 191 166
N/A 9.1 41.1 58.2 50.6
N/A 30 135 120 101
N/A 9.1 41.1 36.6 30.8
N/A 30 98 85 70
N/A 9.1 29.9 25.9 21.3
N/A 30 75 64 51
N/A 9.1 22.9 19.5 15.5
154 20 70 175 215
46.9 6.1 21.3 53.3 65.5
89 20 70 157 133
27.1 6.1 21.3 47.9 40.5
57 20 70 113 94
17.4 6.1 21.3 34.4 28.7
38 20 70 86 70
11.6 6.1 21.3 26.2 21.3
265 N/A 25 110 235
80.8 N/A 7.6 33.5 71.6
117 N/A 25 110 173
35.7 N/A 7.6 33.5 52.7
79 N/A 25 110 124
24.1 N/A 7.6 33.5 37.8
55 N/A 25 110 94
16.8 N/A 7.6 33.5 28.7
219 N/A N/A 15 100
66.8 N/A N/A 4.6 30.5
130 N/A N/A 15 100
39.6 N/A N/A 4.6 30.5
88 N/A N/A 15 100
26.8 N/A N/A 4.6 30.5
62 N/A N/A 15 100
18.9 N/A N/A 4.6 30.5
210 N/A N/A 10 90
64.0 N/A N/A 3.0 27.4
153 N/A N/A 10 90
46.6 N/A N/A 3.0 27.4
104 N/A N/A 10 90
31.7 N/A N/A 3.0 27.4
75 N/A N/A 10 90
22.9 N/A N/A 3.0 27.4
4
(102)
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
181
55.2
107
32.6
71
21.6
50
15.2
229
69.8
140
42.7
97
29.6
70
21.3
250
76.2
156
47.5
108
32.9
79
24.1
210
64.0
183
55.8
128
39.0
94
28.7