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Example:
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_________ Btu/Hr
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_________ Btu/Hr
Total
= _________ Btu/Hr
4. Compare the maximum Btu/Hr the space
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used.
_______ Btu/Hr (maximum the space can
support)
_______ Btu/Hr (actual amount of Btu/Hr
used)
Example:
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space can support)
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Btu/Hr used)
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because the actual Btu/Hr used is more than the
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adjoining room. If the extra space provides an
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See
Ventilation Air From Inside Building
page 7.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors
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If the actual Btu/Hr used is less than the maxi-
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the space is
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fresh air ventilation.
WARNING: If the area in which
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-
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National Fuel
Gas Code, ANSI Z223.1/NFPA 54,
the
International Fuel Gas Code,
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9(17,/$7,21$,5
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AIR FOR COMBUSTION AND VENTILATION
Continued
Figure 2 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills Into
Adjoining
Room,
Option 1
12"
12"
Figure 3 - Ventilation Air from Outdoors
Outlet
Air
Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
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National Fuel Gas Code ANSI
Z223.1/NFPA 54, Air for Combustion and
Ventilation
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grills or ducts.
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Provide extra fresh air by using ventilation
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-
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items directly to the outdoors or spaces open
to the outdoors. These spaces include attics
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National Fuel
Gas Code ANSI Z223.1/NFPA 54, Air for
Combustion and Ventilation
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of ventilation grills or ducts.
IMPORTANT:
Do not provide openings for
inlet or outlet air into attic if attic has a thermo-
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