The weight of the vent stack or chimney must not rest on the boiler's drafthood. Support must be provided in compliance with applicable codes. The boiler top and drafthoodmustbereadilyremovableformaintenanceand inspection. Vent pipe should be adequately supported to maintain proper clearances from combustible construc- tion.
Type "B"
Lowest Discharge
Opening
Listed Cap |
|
| |
Listed Gas Vent |
|
| |
|
| X | |
|
| 12 |
|
|
| Roof Pitch is X/12 | |
|
| H - Minimum Height from | |
|
| Roof to Lowest | |
|
| Discharge Opening | |
| Roof Pitch | H (Min. Ft.) | |
| Flat to 6/12 | 1.0 |
|
| 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 |
|
Fig.# 8191
WARNING: These boilers must not be connected into any portion of mechanical draft systems operating under positive pressure. To do so may cause the flue products to be discharged into the living space causing serious health injury.
For connections to gas vents or chimneys, vent installations shall be in accordance with Part 7, Venting of Equipment, of the National Fuel Gas Code, ANSI Z223.1, or applicable provisions of the local building codes.
COMMON VENTS
Manifolds that connect more than one boiler to a common chimney must be sized to handle the combined load.
Consult available guides for proper sizing of the manifold and the chimney.
At no time should the area be less than the area of the largest outlet.
Fig. #9001
6
