FRESH AIR FOR COMBUSTION AND VENTILATION
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 6). You can also remove door into adjoining room (see option 3, Figure 6). Follow the National Fuel Gas Code, NFPA 54/ ANSI Z223.1, Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts.
Option 1: |
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Ventilation | Option | |
Grills into | ||
3: | ||
Adjoining | ||
Remove | ||
Room | ||
Door into | ||
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| Adjoining | |
| Room |
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Option 2: |
Ventilation Grills into |
Adjoining Rooms |
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WARNING
Rework worksheet, adding the space of the adjoining unconfined space. The combined spaces must have enough fresh air to supply all appliances in both spaces.
Figure 6 - Ventilation Air from Inside Building
VENTILATION AIR FROM OUTDOORS
Provide extra fresh air by using ventilation grills or ducts. You must provide two perma- nent 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, NFPA 54/ANSI Z223.1, Section 5.3, 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
Outlet
Air
Outlet
Air
Ventilated
Outlet Attic
Air
To Attic
To
Crawl
Space
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| Inlet Air |
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| Ventilated |
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| Crawl Space |
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Figure 7 - Ventilation Air from Outdoors
10 | 49D0090 |
