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| Fig. 22: Direct |
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| Model |
| Appliance |
| Certified |
| Vent |
| Min./Max. Vertical |
| Combustion |
| Air Inlet |
| Max. Air |
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| Air Intake |
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| Intake |
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| No. |
| Category |
| Venting |
| Size |
| Venting Height (feet) |
| Pipe |
| Size |
| Length |
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| Material |
| (inches) |
| Min. | Max. |
| Material |
| (inches) |
| (feet) |
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| HD101 |
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| 4 |
| 6 |
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| Galvanized |
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| HD151 |
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| Type B |
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| Steel |
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| HD201 |
| I |
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| (HD201) 6 | 25* |
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| 4 |
| 100 |
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| 5 |
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| PVC |
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| HD251 |
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| Equivalent |
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| (HD251) 6 |
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| ABS |
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| HD301 |
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| (HD301) 11 |
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| CPVC |
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| HD401 |
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| 6 |
| 8 |
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| *Over 25 | feet, use single acting barometric damper. Consult the factory for additional information. |
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| Table N: Vertical Venting |
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30
