4Termination Locations
A. Vent Termination Minimum Clearances
WARNING
Fire Risk.
Explosion Risk.
Maintain vent clearance to combustibles as specifi ed.
• Do not pack air space with insulation or other materials.
Failure to keep insulation or other materials away from vent pipe may cause fi re.
Measure vertical clearances from this surface.
2FT.
MIN.
GAS DIRECT VENT |
TERMINATION CAP
HORIZONTAL
OVERHANG
20 INCHES MIN. | VERTICAL |
| WALL |
LOWEST
DISCHARGE
OPENING
X
12
ROOF PITCH
IS X/ 12
H (MIN.) - MINIMUM HEIGHT FROM ROOF TO LOWEST DISCHARGE OPENING
Measure horizontal clearances from this surface. (See Figure 4.4 for specifi c clearances.)
Figure 4.1 Termination Clearances
GAS, WOOD OR FUEL |
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OIL TERMINATION | B |
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C | TERMINATION | |||||
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A
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| Termination | Termination | |
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A | 6 in. | 20 in. min. | Horizontal distance between terminations |
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B | 20 in. | 24 in. min. | Distance to perpendicular wall |
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C | 18 in. | 18 in. | Vertical distance between terminations |
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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 specifi es minimum vent heights for various pitched roofs.
Figure 4.2 Multiple Vertical Termination
Page 8 | August 1, 2008 |
