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119315-01D8
The space in the example is a conned space
because the actual Btu/Hr used is more than the
maximum Btu/Hr the space can support. You
must provide additional fresh air. Your options
are as follows:
A. Rework worksheet, adding the space of an
adjoining room. If the extra space provides an
unconned space, remove door to adjoining
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 replace, if lower Btu/Hr
size makes room unconned.
If the actual Btu/Hr used is less than the maximum
Btu/Hr the space can support, the space is an
unconned space. You will need no additional
fresh air ventilation.
WARNING: If the area in which
in the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 Section 5.3
This fresh air would come from an adjoining
unconfined space. When ventilating to an
adjoining unconned space, you must provide
two permanent openings: one within 12" of the
ceiling and one within 12" of the oor on the
wall connecting the two spaces (see options 1
and 2, Figure 4). You can also remove door into
adjoining room (see option 3, Figure 4). 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.
Provide extra fresh air by using ventilation
AIR FOR COMBUSTION
AND VENTILATION
Continued
grills or ducts. You must provide two perma-
nent openings: one within 12" of the ceiling
and one within 12" of the oor. 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 thermo-
stat-controlled power vent. Heated air entering
the attic will activate the power vent.
Figure 4 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option 3
Ventilation Grills
Into Adjoining Room,
Option 2
12"
12"
Ventilation
Grills
into
Adjoining
Room,
Option 1
Figure 5 - Ventilation Air from Outdoors
Outlet
Air
V entilated
Attic
Outlet
Air
Inlet
Air
Inlet Air
V entilated
Crawl Space
T o
Crawl
Space
T o Attic