![](/images/new-backgrounds/1308066/30806619x1.webp)
Table 2. Maximum Pipe Length
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| ALLOWABLE PIPE LENGTH (feet) |
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| ALTITUDE | FURNACE |
| PIPE |
| NUMBER OF SWEEP ELBOWS (SEE NOTE 1) |
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| INPUT |
| DIA. | 1 | 2 | 3 |
| 4 |
| 5 | 6 | 7 | 8 |
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| 54,000 | 2" | 112 | 108 | 104 |
| 100 |
| 96 | 92 | 88 | 84 |
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| 72,000 | 2" | 55 | 51 | 47 | 43 |
| 39 | 35 | 31 | 27 |
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| 72,000 | 3" | 150 | 150 | 150 | 150 |
| 150 | 150 | 150 | 150 |
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| 90,000 | 2" | 36 | 32 | 28 | 24 |
| 20 | 16 | - | - |
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| 90,000 | 3" | 150 | 150 | 150 | 145 |
| 140 | 135 | 130 | 125 |
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| 108,000 | 3" | 85 | 80 | 75 | 70 |
| 65 | 60 | 55 | 50 |
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| 126,000 | 3" | 62 | 57 | 52 | 47 |
| 42 | 37 | 32 | 27 |
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| 54,000 | 2" | 97 | 93 | 90 | 86 |
| 83 | 80 | 76 | 73 |
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| 72,000 | 2" | 44 | 40 | 36 | 33 |
| 30 | 26 | 23 | 19 |
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| 72,000 | 3" | 150 | 150 | 150 | 150 |
| 150 | 150 | 150 | 150 |
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| 90,000 | 2" | 30 | 26 | 23 | 19 |
| 16 | - | - | - |
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| 90,000 | 3" | 140 | 135 | 130 | 125 |
| 120 | 115 | 110 | 105 |
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| 108,000 | 3" | 75 | 70 | 65 | 60 |
| 55 | 50 | 45 | 40 |
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| 126,000 | 3" | 50 | 45 | 40 | 35 |
| 30 | 25 | 20 | 15 |
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| 54,000 | 2" | 84 | 81 | 78 | 74 |
| 71 | 67 | 64 | 61 |
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| 72,000 | 2" | 37 | 34 | 30 | 27 |
| 24 | 21 | 18 | 15 |
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| 72,000 | 3" | 150 | 150 | 150 | 150 |
| 150 | 150 | 150 | 150 |
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| 90,000 | 2" | 24 | 21 | 18 | 14 |
| 11 | - | - | - |
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| 90,000 | 3" | 125 | 120 | 115 | 110 |
| 105 | 100 | 95 | 90 |
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| 108,000 | 3" | 50 | 45 | 40 | 35 |
| 30 | 25 | 20 | 15 |
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| 126,000 | 3" | 40 | 35 | 30 | 25 |
| 20 | 15 | - | - |
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| 54,000 | 2" | 71 | 68 | 64 | 61 |
| 58 | 55 | 51 | 48 |
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| 72,000 | 2" | 30 | 27 | 23 | 20 |
| 17 | 13 |
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| 72,000 | 3" | 150 | 150 | 150 | 150 |
| 150 | 150 | 150 | 150 |
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| 90,000 | 2" | 19 | 16 | 12 | - |
| - | - | - | - |
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| 90,000 | 3" | 100 | 95 | 90 | 85 |
| 80 | 75 | 70 | 65 |
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| 108,000 | 3" | 37 | 32 | 27 | 22 |
| 17 | 12 | - | - |
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| 126,000 | 3" | 30 | 25 | 20 | 15 |
| 10 | - | - | - |
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| 126,000 |
| 3" | 62 | 57 | 52 |
| 47 |
| 42 | 37 | 32 | 27 |
| See Note 2 |
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| 54,000 | 2" | 57 | 54 | 50 |
| 47 |
| 44 | 40 | 36 | 33 |
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| 72,000 | 2" | 25 | 22 | 19 | 16 |
| 12 | - | - | - |
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| 72,000 | 3" | 150 | 150 | 150 | 150 |
| 150 | 150 | 150 | 150 |
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| 90,000 | 3" | 85 | 80 | 75 | 70 |
| 65 | 60 | 55 | 50 |
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| 108,000 |
| 3" | 85 | 80 | 75 |
| 70 |
| 65 | 60 | 55 | 50 |
| See Note 2 |
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| 126,000 |
| 3" | 62 | 57 | 52 |
| 47 |
| 42 | 37 | 32 | 27 |
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| 54,000 | 2" | 43 | 40 | 37 |
| 33 |
| 30 | 27 | 24 | 20 |
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| 72,000 | 2" | 21 | 18 | 14 | 11 |
| - | - | - | - |
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| 72,000 | 3" | 150 | 150 | 150 | 150 |
| 150 | 150 | 150 | 150 |
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| 90,000 | 3" | 70 | 65 | 60 | 55 |
| 50 | 45 | 40 | 35 |
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| 108,000 |
| 3" | 85 | 80 | 75 |
| 70 |
| 65 | 60 | 55 | 50 |
| See Note 2 |
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| 126,000 |
| 3" | 62 | 57 | 52 |
| 47 |
| 42 | 37 | 32 | 27 |
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| 54,000 |
| 2" | 110 | 106 | 104 |
| 100 |
| 96 | 92 | 88 | 84 |
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| 72,000 |
| 2" | 50 | 46 | 43 |
| 40 |
| 36 | 32 | 29 | 25 |
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| 72,000 |
| 3" | 150 | 150 | 150 |
| 150 |
| 150 | 150 | 150 | 150 |
| See Note 2 | |
| 90,000 |
| 3" | 150 | 150 | 150 |
| 145 |
| 140 | 135 | 130 | 125 |
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| 108,000 |
| 3" | 85 | 80 | 75 |
| 70 |
| 65 | 60 | 55 | 50 |
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| 126,000 |
| 3" | 62 | 57 | 52 |
| 47 |
| 42 | 37 | 32 | 27 |
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| 54,000 |
| 2" | 97 | 93 | 90 |
| 86 |
| 83 | 80 | 76 | 73 |
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| 72,000 |
| 2" | 50 | 46 | 43 |
| 40 |
| 36 | 32 | 29 | 25 |
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| 72,000 |
| 3" | 150 | 150 | 150 |
| 150 |
| 150 | 150 | 150 | 150 |
| See Note 2 | |
| 90,000 |
| 3" | 150 | 150 | 150 |
| 145 |
| 140 | 135 | 130 | 125 |
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| 108,000 |
| 3" | 85 | 80 | 75 |
| 70 |
| 65 | 60 | 55 | 50 |
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| 126,000 |
| 3" | 60 | 55 | 50 |
| 45 |
| 40 | 35 | 30 | 25 |
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| 54,000 |
| 2" | 84 | 81 | 78 |
| 74 |
| 71 | 67 | 64 | 61 |
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| 72,000 |
| 2" | 41 | 38 | 34 |
| 31 |
| 28 | 24 | 21 | 17 |
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| 72,000 |
| 3" | 150 | 150 | 150 |
| 150 |
| 150 | 150 | 150 | 150 |
| See Note 2 | |
| 90,000 |
| 3" | 150 | 150 | 150 |
| 145 |
| 140 | 135 | 130 | 125 |
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| 108,000 |
| 3" | 70 | 65 | 60 |
| 55 |
| 50 | 45 | 40 | 35 |
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| 126,000 |
| 3" | 45 | 40 | 35 |
| 30 |
| 25 | 20 | 15 |
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| 54,000 |
| 2" | 71 | 68 | 64 |
| 61 |
| 58 | 55 | 51 | 48 |
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| 72,000 |
| 2" | 35 | 31 | 28 |
| 25 |
| 21 | 18 | 15 | - |
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| 72,000 |
| 3" | 150 | 150 | 150 |
| 150 |
| 150 | 150 | 150 | 150 |
| See Note 2 | |
| 90,000 |
| 3" | 150 | 150 | 150 |
| 145 |
| 140 | 135 | 130 | 125 |
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| 108,000 |
| 3" | 55 | 50 | 45 |
| 40 |
| 35 | 30 | 25 | 20 |
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| 126,000 |
| 3" | 35 | 30 | 25 |
| 20 |
| 15 | 10 | - | - |
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NOTE 1: The table assumes the use of sweep elbows. If using hard 90? elbows, the vent length should be decreased an additional 3 feet for every elbow used.
NOTE 2: The shaded portions of the table require the high altitude pressure switch in order to operate the furnace at the listed vent lengths.
Page 10 | Installer’s Information Manual |