4Termination Locations
A. Vent Termination Minimum Clearances
WARNING
Fire Risk. Explosion Risk.
Maintain vent clearance to combustibles as specified.
•Do not pack air space with insulation or other materials.
Failure to keep insulation or other materials away from vent pipe may cause fire.
Measure vertical clearances from this surface.
Measure horizontal clearances from this surface. (See Figure 4.4 for specific clearances.)
Figure 4.1 Termination Clearances
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| 24 in. (610mm) | |||
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| Termination |
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| Wall (Gas Only) | ||
18 in. |
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(457mm)
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| HORIZONTAL | |
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| OVERHANG | |
2 FT. | 2 FT. |
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MIN. | VERTICAL | ||
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| LOWEST | WALL | |
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| DISCHARGE |
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| OPENING |
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TERMINATION |
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CAP |
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| X | |
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| 12 | |
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| ROOF PITCH | |
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| IS X/12 | |
| H (MIN.) - MINIMUM HEIGHT FROM ROOF | ||
| TO LOWEST DISCHARGE OPENING | ||
Roof Pitch | H (Min.) Ft. |
Flat to 6/12 | 1.0* |
Over 6/12 to .......................................................7/12 | 1.25* |
Over 7/12 to 8/12 | 1.5* |
Over 8/12 to 9/12 | 2.0* |
Over 9/12 to 10/12 | 2.5* |
Over 10/12 to 11/12 | 3.25 |
Over 11/12 to 12/12 | 4.0 |
Over 12/12 to 14/12 | 5.0 |
Over 14/12 to 16/12 | 6.0 |
Over 16/12 to 18/12 | 7.0 |
Over 18/12 to 20/12 | 7.5 |
Over 20/12 to 21/12 | 8.0 |
* 3 foot minimum in snow regions
Figure 4.3 Minimum Height from Roof to Lowest Discharge Opening
Figure 4.3 specifies minimum vent heights for various pitched roofs.
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| Gas Termination | Wood & Fuel Oil Termination |
A | 6 in. (152mm) | 20 in. (508mm) |
Figure 4.2 Multiple Vertical Termination
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Page 8 | January 3, 2007 | ||
