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.
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 specific clearances.)
Figure 4.1 Termination Clearances
A | B |
6 in. (minimum) up to 20 in. | 18 in. minimum |
152 mm/508 mm | 457 mm |
20 in. and over | 0 in. minimum |
Gas, Wood or Fuel Oil
Termination Cap
B
A *
Gas
Termination
Cap **
*If using decorative cap cover(s), this distance may need to be increased. Refer to the installation instructions supplied with the decorative cap cover.
**In a staggered installation with both gas and wood or fuel oil terminations, the wood or fuel oil termination cap must be higher than the gas termination cap.
Figure 4.2 Staggered Termination Caps
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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