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AIR FOR COMBUSTION
AND VENTILATION
Continued
The space in the above example is a confined 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 ad-
joining room. If the extra space provides an
unconfined 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 Venti-
lation Air From Outdoors.
C. Install a lower Btu/Hr fireplace, if lower Btu/Hr
size makes room unconfined.
If the actual Btu/Hr used is less than the maxi-
mum Btu/Hr the space can support, the space is
an unconfined space. You will need no additional
fresh air ventilation.
WARNING: If the area in
which the fireplace may be op-
erated is smaller than that de-
fined as an unconfined space or
if the building is of unusually
tight construction, provide ad-
equate combustion and ventila-
tion air by one of the methods
described in the National Fuel
Gas Code, ANSI Z223.1/NFPA
54 Section 5.3 or applicable lo-
cal codes .
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining un-
confined space. When ventilating to an adjoining
unconfined space, you must provide two perma-
nent 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 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.
8
Ventilation
Grills
into Adjoining
Room,
Option 1
Figure 4 - Ventilation Air from Inside
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills
or ducts. You must provide two permanent open-
ings: 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-con-
trolled power vent. Heated air entering the attic
will activate the power vent.
Outlet
Air
Inlet
Air
Figure 5 - Ventilation Air from Outdoors
www.desatech.com
12"
Ventilation Grills
Into Adjoining Room,
Option 2
Or
Remove
Door into
Adjoining
Room,
Option 3
12"
Building
Ventilated
Outlet
Attic
Air
Inlet Air
Crawl Space
To Attic
To
Crawl
Space
Ventilated
113110-01A
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