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124978-01B 7
If your home meets all of the three criteria
See Ventilation Air From Outdoors
If your home does not meet all of the three
Determining
Fresh-Air Flow For Fireplace Location
The National Fuel Gas Code, ANSI Z223.1.3/
NFPA 54
3-
gregate input rating of all appliances installed
3
of the aggregate input rating of all appliances
installed in that space. Rooms communicating
-
AIR FOR COMBUSTION AND VENTILATION
Continued
DETERMINING FRESH-AIR FLOW
-
the rooms.
1. Determine the volume of the space (length
Length x Width x Height =__________cu. ft.
(volume of space)
Example:
(volume of space)
volume of these rooms to the total volume
of the space.
2. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
________ (volume of space) x 20 = (Maxi-
mum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space) x 20
support)
3. Add the Btu/Hr of all fuel burning appliances
in the space.
__________ Btu/Hr
__________ Btu/Hr
__________ Btu/Hr
Vented gas heater __________ Btu/Hr
__________ Btu/Hr
Other gas appliances* + _________ Btu/Hr
Total = _________ Btu/Hr
* Do not include direct-vent gas appliances.
outdoors and vents to the outdoors.
Example:
__________ Btu/Hr
_________ Btu/Hr
Total = _________ Btu/Hr
4. Compare the maximum Btu/Hr the space
Hr used.
_______
Btu/Hr (maximum the space can
support)
_______
Btu/Hr (actual amount of Btu/Hr
used)
Example:
space can support)
Btu/Hr used)
space because the actual Btu/Hr used is more
than the maximum Btu/Hr the space can sup-
See Ventilation Air From Inside Building,
page 8.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors, page 8.
If the actual Btu/Hr used is less than the maxi-
the space is
fresh air ventilation.