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You must provide additional fresh air. Your options are as follows:
A. Rework work sheet, adding the space of an adjoining room. If the
extra space provides an unconfined space, remove door to adjoin-
ing room or add ventilation grills between rooms. See Ventilation
Air from Inside Building.
B. Vent room directly to the outdoors. See Ventilation Air from
Outdoors, .
C. Install a lower Btu/Hr gas log appliance, if lower Btu/Hr size makes
room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space
can support, the space is an unconfined space. You will need no ad-
ditional fresh air ventilation.
WARNING: If the area in which the appliance may
be operated does not meet the required volume for
indoor combustion air, combustion and ventilation air
shall be provided by one of the methods described in
the National Fuel Gas Code, ANSI Z223.1/NFPA 54, the
International Fuel Gas Code, 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 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 option 1,
Figure 3). You can also remove door into adjoining room (see option
2, Figure 3). Follow the National Fuel Gas Code ANS Z223.1/NFPA
54 Air for Combustion and Ventilation for required size of ventilation
grills or ducts.
AIR FOR COMBUSTION AND VENTILATION
Continued
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 ANS Z223.1/NFPA
54 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.
Figure 3 - Ventilation Air from Inside Building
Or
Remove
Door into
Adjoining
Room,
Option
2
Ventilation
Grills Into
Adjoining
Room,
Option 1
Figure 4 - Ventilation Air from Outdoors
Outlet
Air
Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
