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20002538
W A R N I N G
This heater shall not be installed in a confined
space or unusually tight construction unless
provisions are made for adequate combustion
and ventilation air.
W A R N I N G
If the area in which the heater may be operated
is smaller than that defined as an unconfined
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, ANSI Z223.1/NFPA
54, 1992 Sections 5.3, or applicable codes.
WARNING:
Before installing the gas logset in a solid-
fuel burning fireplace, the chimney flue and firebox must
be cleaned of soot, creosote and loose paint by a quali-
fied chimney cleaner.
vent370-2
Ventilation options
3/26/99 djt
Option 1 -
Vents to
Adjoining
Rooms
Option 2 -
Remove Door to
Adjoining Rooms
Option 3 -
Vents to
Adjoining
Room
Fig. 2 Ventilaton options for confined spaces.
12”
12”
VO370-2
4. Compare the maximum BTU/hour rating the space
can support with the total BTU/hour used by the appli-
ances.
Example: 76,800 BTU/hour the space can support
80,000 BTU/hour used by appliances
In this example, the maximum BTU/hour that the space
can support is less than the total used by the applianc-
es. The space is considered to be Confined Space.
Additional air must be provided to meet the require-
ments of the vent-free gas log set.
The installation and the provisions for combustion and
ventilation air must conform with the National Fuel Gas
Code, ANSI Z223.1/NFPA 54, or the CSA-B149 Installa-
tion Code (Series).
A confined space may be ventilated in two ways:
A. Open or provide at least two ventilating grilles to an
adjoining unconfined space. (Fig. 2)
Each of the two grilles must provide an opening of at
least 50 square inches, with all opening dimensions be-
ing at least 3”. One grille must be within 12” of the ceil-
ing; the other within 12” of the floor. (If the total exceeds
100,000 BTU/hour, additional grilles will be needed.)
B. Vent the room directly to the outdoors. (Provide one
square inch of opening for each 4,000 BTU/hour)
For further information on ventilation guidelines and siz-
ing specifications, follow the National Fuel Gas Code/
NFPA 54/ANSI Z223.1, Section 5.3.
If the total BTU/hour used by the appliances is less than
the maximum BTU/hr the space can support, the room
meets the Unconfined Space criteria and no further
ventilation is needed.