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114745-01
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6
AIR FOR COMBUSTION AND
VENTILATION
Continued
Figure 3 - Ventilation Air from Outdoors
Figure 2 - Ventilation Air from Inside Building
Outlet
Air
Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option
2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"
AIR FOR COMBUSTION AND VENTILATION
Ventilation Air
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining unconfined space. When ven-
tilating 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 2). You can also
remove door into adjoining room (see option 3, Figure 2). 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.
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, 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 thermostat-controlled power vent. Heated air entering the attic will
activate the power vent.
114745-01