AIR FOR COMBUSTION AND VENTILATION
Continued
WARNING:Iftheareainwhich the heater may be operated does not meet the required volume for indoor combustion air, combustion and ventilation air shall be provided by one of the methods described in the National Fuel GasCode,ANSIZ223.1/NFPA54, the International Fuel Gas Code, or applicable local codes.
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, you must provide 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 1 and 2, Figure 4). You can also remove door into adjoining room (see option 3, Figure 4). Follow the National Fuel Gas Code, ANSI Z223.1/NFPA 54, Air for Combustion and Ventilation for required size of ventilation grills or ducts.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent 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. Follow the National Fuel Gas Code, ANSI Z223.1/NFPA 54, Air for Combustion and Ventilation for required size of ventilation grills or ducts.
IMPORTANT: Do not provide openings for inlet or outlet air into attic if attic has a thermostat
| Outlet | Ventilated |
| Attic | |
| Air | |
|
| |
Outlet |
|
|
Air |
| To Attic |
|
| |
|
| To |
|
| Crawl |
Inlet |
| Space |
|
| |
Air |
|
|
| Inlet Air | Ventilated |
| Crawl Space | |
|
|
Figure 5 - Ventilation Air from Outdoors
Shown with Optional Mantel
| 12" | |
| Ventilation Grills | |
Ventilation | Into Adjoining Room, | |
Option 2 | ||
Grills into | ||
Or | ||
Adjoining | Remove | |
Room, | Door into | |
Option 1 | Adjoining | |
| Room, | |
| Option 3 | |
| 12" |
Figure 4 - Ventilation Air from Inside Building Shown with Optional Mantel
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