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AIR FOR
COMBUSTION
AND
VENTILATION
Continued
101309
If the area in which the heater may be operated is smaller than
that defined as an unconfined space, provide adequate combus-
tion and ventilation air by one of the methods described in the
National Fuel Gas Code, ANSI Z223.1, 1992, Section 5.3.
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 2). You can also remove door into adjoining room (see option 3, Figure 2). 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.
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.
Ventilation
Grills
Into Adjoining
Room,
Option 1
Figure 2 - 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.
IMPORTANT:
Do not provide openings for inlet or outlet air into attic if attic has a thermo-
stat-controlled power vent. Heated air entering the attic will activate the power vent.
Outlet
Air
Inlet
Air
Figure 3 - Ventilation Air from Outdoors
WARNING
WARNING ICON
G 001
WARNING
WARNING ICON
G 001
12"
Ventilation Grills
Into Adjoining Room,
Or
Option 2
Remove
Door into
Adjoining
Room,
Option
3
12"
Ventilated
Outlet
Attic
Air
Ventilated
Inlet Air
Crawl Space
To Attic
To
Crawl
Space
7
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