Vermont Casting VL24LP W A R N I N G, A confined space may be ventilated in two ways, 20002538

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.

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.

12”

Option 1 -

Vents to

Adjoining

RoomsOption 3 -

Vents to

Adjoining

Room

Option 2 -

Remove Door to

Adjoining Rooms

12”

VO370-2

Fig. 2 Ventilaton options for confined spaces.

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