4 Termination Locations
A. Vent Termination Minimum Clearances
Figure 4.1 specifies minimum vent heights for various pitched roofs.
HORIZONTAL
OVERHANG
WARNING
Fire Risk.
Asphyxiation Risk.
•Terminations MUST meet minimum clearances.
•Exhaust gases are hot.
•Nearby vents may draw fumes into house.
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
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 4.1 Minimum height from roof to lowest discharge opening
9 |
