4 Termination Locations
A. Vent Termination Minimum Clearances
HORIZONTAL OVERHANG
WARNING
Fire Risk. Explosion Risk.
Inspect external vent cap regularly.
•Ensure no debris blocks cap.
•Combustible materials blocking cap may ignite.
•Restricted air flow affects burner operation.
2FT.
MIN.
GAS DIRECT VENT |
TERMINATION CAP |
20 INCHES MIN. | VERTICAL |
LOWEST | WALL |
| |
DISCHARGE |
|
OPENING |
|
X
12
ROOF PITCH
IS X/ 12
H (MIN.) - MINIMUM HEIGHT FROM ROOF TO LOWEST DISCHARGE OPENING
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
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 4.2 Minimum height from roof to lowest discharge opening
Figure 4.2 specifies minimum vent heights for various pitched roofs.
GAS, WOOD OR FUEL |
|
OIL TERMINATION | B |
|
GAS
CTERMINATION
A
| Gas | Wood & Fuel Oil | Comments |
| 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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Figure 4.3 Multiple Vertical Termination
Heat & Glo • | 11 |