6
AIR FOR COMBUSTION AND VENTILATION
Ventilation Air
AIR FOR COMBUSTION AND VENTILATION
Continued
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
Ventilation
Grills
Into Adjoining
12"
Ventilation Grills Into Adjoining Room,
1 and 2, Figure 2). You can also remove door into adjoining room
Room,
Or
Option 2
(see option 3, Figure 2). Follow the National Fuel Gas Code, ANSI
Option 1
Remove
Z223.1/NFPA 54, Section 5.3, 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 ceil- ing 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, 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
Door into Adjoining Room, Option 
3
12"
Figure 2 - Ventilation Air from Inside Building
Ventilated
Outlet Attic
Air
Outlet |
|
Air | To Attic |
|
To
Crawl
Space
Inlet
Air
Inlet Air |
| Ventilated |
|
| Crawl Space |
|
|
Figure 3 - Ventilation Air from Outdoors
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