Vanguard FBST Fire Pit User Manual


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105116-01D 7
The space in the above example is a conned
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 work sheet, adding the space of an
adjoining room. If the extra space provides an
unconned 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 Ven-
tilation Air from Outdoors.
C. Install a lower Btu/Hr gas log heater, if lower
Btu/Hr size makes room unconned.
If the actual Btu/Hr used is less than the maxi-
mum Btu/Hr the space can support, the space is
an unconned space. You will need no additional
fresh air ventilation.
WARNING: If the area in
whichthereboxandgaslog
heater may be operated is
smaller than that dened as
an unconnedspace orif the
building is of unusually tight
construction, provide adequate
combustionandventilationair
byoneofthemethodsdescribed
in the National Fuel Gas Code,
ANS Z223.1/NFPA 54, Section 5.3
or applicable local codes.
VENTILATION AIR
VentilationAirFromInsideBuilding
This fresh air would come from an adjoining un-
conned space. When ventilating to an adjoining
unconned space, you must provide two perma-
nent openings: one within 12" of the ceiling and
one within 12" of the oor on the wall connecting
the two spaces (see option 1, Figure 3). You can
also remove door into adjoining room (see op-
tion 2, Figure 3). Follow the National Fuel Gas
Code ANS Z223.1/NFPA 54, Section 5.3, Air for
Combustion and Ventilation for required size of
ventilation grills or ducts.
AIR FOR COMBUSTION
AND VENTILATION
Continued
WARNING: Rework work-
sheet, adding the space of the
adjoiningunconnedspace.The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.
Figure 3 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
2
Ventilation
Grills
Into Adjoining
Room,
Option 1
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 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 ANS 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-
controlled power vent. Heated air entering the attic
will activate the power vent.
Figure 4 - Ventilation Air from Outdoors
Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air
Ventilated
Crawl Space
To
Crawl
Space
To Attic
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