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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 appliances. The space is considered to be Confined Space. Additional air must be provided to meet the requirements of the vent-free heater. 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 being at least 3”. One grille must be within 12” of the ceiling; 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 sizing 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 Spacecriteria and no further ventilation is needed. WARNING This heater shall not be installed in a confined space unless provisions are made for adequate combustion and ventilation air. WARNING If the area in which the heater may be operated is smaller than that defined as an unconfined space, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1, 1992 Section 5.3. Option 1 - Vents to Adjoining Rooms Option 3 - Vents to Adjoining Room Option 2 - Remove Door to Adjoining Room VO370-2 Fig. 5 Supplementing ventilation air. Wall 10” 12” 8” 6” 4” 2” 10” 8” 6” 4” 2” 1” Wall 10” 12” 8” 6” 4” 2” 10” 8” 6” 4” 2” 1” Vermont Castings Jefferson Vent Free Gas Heater Clearance Requirements Hearth Requirements Minimum Clearances to Combustible Materials The JUVS must be installed on rigid flooring. If the appliance is installed on any combustible surface other than wood flooring, such as carpet or tile, a metal or wood panel must be installed to extend the full length Maintain clearance, (empty space), between combus and width of the unit. tible materials and the heater as specified. Alcove Clearances ST103 B C DB A A: Ceiling .................. 27Z\x” C: Rear Wall ................... 4” B: Side Wall .............. 4” D: Max. Alcove Depth ..... 48” WARNING • • • • Do not install this heater in a bathroom or bedroom. Installation of this heater must conform with Local Codes or in the absence of Local Codes, with the National Fuel Gas Code, ANSI Z223.1. This heater creates warm air currents. These currents move heat to wall surfaces next to the heater. Installing the heater next to vinyl or cloth wall coverings or operating the heater where impurities in the air such as tobacco smoke exist, may discolor walls. Do not use a blower insert, heat exchanger insert or other accessory not approved...

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