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AIR FOR
COMBUSTION
AND
VENTILATION
Continued
WARNING: If the area in which
the heater may be operated is
smaller than that defined as an
unconfined space, provide ad-
equate combustion and ventila-
tion air by one of the methods
described in the National Fuel
Gas Code, ANSI Z223.1, 1992,
Section 5.3 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 pro-
vide 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 op-
tion 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.
W A R N I N G : R e w o r k
worksheet, adding the space of
the adjoining unconfined space.
The combined spaces must have
enough fresh air to supply all
appliances in both spaces.
101850
Ventilation
Grills
Or
into Adjoining
Remove
Room,
Door into
Option 1
Adjoining
Room,
Option 3
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 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.
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.
Outlet
Air
Inlet
Air
Figure 3 - Ventilation Air from Outdoors
5
OWNER'S MANUAL
Ventilation Grills
Into Adjoining Room,
Option 2
12"
Ventilated
Outlet
Attic
Air
Ventilated
Inlet Air
Crawl Space
12"
To Attic
To
Crawl
Space
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