UNVENTED |
|
| FIREBOX |
AIR FOR |
|
|
|
COMBUSTION | AND |
| |
VENTILATION |
|
|
|
Continued |
| Ventilation |
|
VENTILATION AIR |
| Grills | Ventilation Grills |
| Into Adjoining | Into Adjoining Room, | |
|
| ||
Ventilation Air From Inside | Room, | Option 2 | |
|
| ||
Building
Option 1
This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, you must pro- vide two permanent openings: one within 12" of the ceiling and one within 12" of the floor on the wall connecting the two spaces (see options 1and 2, Figure 4). You can also remove door into adjoining room (see op- tion 3, Figure 4), Follow the National Fuel Gas Code NFPA 54/ANS Z223.1, Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts.
WARNING: Rework work-
Figure 4 - Ventilation Air from Inside Building
sheet, adding the space of the adjoining unconfined space. The combined spaces must have enough fresh air to supply all appliances In both spaces.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or ducts. You must provide two per- manent openings: one within 12" of the ceiling and one within 12" of the floor. Connect these items directly to the outdoors or spaces open to the outdoors. These spaces include attics and crawl spaces.
IMPORTANT: Do not provide openings for inlet or outlet air into attic if attic has a
Outlet
Air
To Attic
To
Crawl
Space
Inlet
Air | I | I |
|
entering the attic will activate the power vent.
Inlet Air
ventilated
Crawl Space
Figure 5 - Ventilation Air from Outdoors
6 | 103573 |
