![](/images/new-backgrounds/1308066/30806615x1.webp)
Table 1. Maximum Pipe Length
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| ALLOWABLE PIPE LENGTH (feet of each pipe) |
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| ALTITUDE | FURNACE |
| PIPE | NUMBER OF SWEEP ELBOWS (each pipe) | (SEE NOTE 1) |
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| INPUT |
| DIA. | 1 | 2 | 3 | 4 | 5 |
| 6 |
| 7 | 8 |
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| 54,000 | 2" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 72,000 | 2" | 40 | 40 | 37 | 33 | 30 |
| 27 |
| 23 | 20 |
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| 72,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 90,000 | 2" | 30 | 26 | 22 | 19 | 15 |
| 11 |
| - | - |
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| 90,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 108,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 126,000 | 3" | 40 | 40 | 40 | 40 | 35 |
| 30 |
| 25 | 20 |
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| 54,000 | 2" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 72,000 | 2" | 40 | 37 | 33 | 29 | 25 |
| 21 |
| 19 | 15 |
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| 72,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 90,000 | 2" | 25 | 22 | 19 | 16 | 12 |
| - |
| - | - |
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| 90,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 108,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 126,000 | 3" | 40 | 38 | 33 | 28 | 22 |
| 16 |
| 11 | - |
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| 54,000 | 2" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 72,000 | 2" | 35 | 33 | 29 | 25 | 21 |
| 17 |
| 13 | - |
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| 72,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 90,000 | 2" | 22 | 19 | 16 | 14 | - |
| - |
| - | - |
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| 90,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 108,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 126,000 | 3" | 35 | 30 | 25 | 20 | 15 |
| 10 |
| - | - |
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| 54,000 | 2" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 72,000 | 2" | 30 | 28 | 26 | 24 | 22 |
| 20 |
| 18 | 17 |
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| 72,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 90,000 | 2" | 15 | 13 | 11 | - | - |
| - |
| - | - |
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| 90,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 108,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 126,000 | 3" | 30 | 25 | 20 | 15 | 10 |
| - |
| - | - |
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| 126,000 |
| 3" | 40 | 40 | 40 | 40 | 35 |
| 30 |
| 25 | 20 |
| See Note 2 below. |
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| 54,000 | 2" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 72,000 | 2" | 26 | 22 | 17 | 14 | 12 |
| - |
| - | - |
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| 72,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 90,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 108,000 | 3" | 40 | 40 | 40 | 35 | 30 |
| 25 |
| 20 | 15 |
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| 108,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
| See Note 2 below. |
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| 126,000 |
| 3" | 40 | 40 | 40 | 40 | 35 |
| 30 |
| 25 | 20 |
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| 54,000 | 2" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 72,000 | 2" | 21 | 18 | 14 | 11 | - |
| - |
| - | - |
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| 72,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 90,000 | 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 108,000 | 3" | 40 | 35 | 30 | 25 | 20 |
| 15 |
| 10 | - |
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| 108,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
| See Note 2 below. |
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| 126,000 |
| 3" | 40 | 40 | 40 | 40 | 35 |
| 30 |
| 25 | 20 |
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| 54,000 |
| 2" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 72,000 |
| 2" | 40 | 40 | 40 | 40 | 36 |
| 32 |
| 28 | 24 |
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| 72,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 90,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
| See Note 2 below. | |
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| 108,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 126,000 |
| 3" | 40 | 40 | 40 | 40 | 35 |
| 30 |
| 25 | 20 |
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| 54,000 |
| 2" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 72,000 |
| 2" | 40 | 40 | 40 | 37 | 35 |
| 32 |
| 28 | 24 |
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| 72,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 90,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
| See Note 2 below. | |
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| 108,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 126,000 |
| 3" | 40 | 40 | 40 | 40 | 35 |
| 30 |
| 25 | 20 |
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| 54,000 |
| 2" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 72,000 |
| 2" | 40 | 40 | 37 | 34 | 31 |
| 28 |
| 24 | 21 |
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| 72,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 90,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
| See Note 2 below. | |
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| 108,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 126,000 |
| 3" | 40 | 40 | 40 | 35 | 30 |
| 25 |
| 20 | 15 |
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| 54,000 |
| 2" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 72,000 |
| 2" | 40 | 37 | 35 | 31 | 27 |
| 24 |
| 21 | 18 |
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| 72,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 90,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
| See Note 2 below. | |
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| 108,000 |
| 3" | 40 | 40 | 40 | 40 | 40 |
| 40 |
| 40 | 40 |
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| 126,000 |
| 3" | 40 | 35 | 30 | 25 | 20 |
| 15 |
| - | - |
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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 8 | Installer’s Information Manual |