BG961UHE Gas Furnace Installation Manual

507768-02BPage 20 of 56 Issue 1904
BG961UHE Maximum Allowable Intake or Exhaust Vent Length in Feet
Concentric Termination at Elevation 0 - 4,500 ft
Number of
90° Elbows
Used
2” Pipe 2-1/2" Pipe 3" Pipe
Capacity Capacity Capacity
045 070 090 110 045 070 090 110 045 070 090 110
1 68 53 37 17 100 85 59 34 116 116 109 109
2 63 48 32 12 95 80 54 29 111 111 104 104
3 58 43 27 7 90 75 49 24 106 106 99 99
4 53 38 22
n/a
85 70 44 19 101 101 94 94
5 48 33 17 80 65 39 14 96 96 89 89
6 43 28 12 75 60 34
n/a
91 91 84 84
7 38 23 7 70 55 29 86 86 79 79
8 33 18
n/a
65 50 24 81 81 74 74
9 28 13 60 45 19 76 76 69 69
10 23 8 55 40 14 71 71 64 64
Concentric Termination Elevation 4501 - 10,000 ft
Number of
90° Elbows
Used
2” Pipe 2-1/2" Pipe 3" Pipe
Capacity Capacity Capacity
045 070 090 110 045 070 090 110 045 070 090 110
1 68 53 37
n/a
100 85 59 34 116 116 109 109
2 63 48 32 95 80 54 29 111 111 104 104
3 58 43 27 90 75 49 24 106 106 99 99
4 53 38 22 85 70 44 19 101 101 94 94
5 48 33 17 80 65 39 14 96 96 89 89
6 43 28 12 75 60 34
n/a
91 91 84 84
7 38 23 7 70 55 29 86 86 79 79
8 33 18
n/a
65 50 24 81 81 74 74
9 28 13 60 45 19 76 76 69 69
10 23 8 55 40 14 71 71 64 64
*Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and
Exhaust must be same pipe size.
Table 5B.