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Rooms communicating directly with the space in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconfined space. 1. Determine the volume of space, (length x width x height).Include adjoining rooms connected by doorless passageways or ventilating grilles. Example: A room that is 18' x 12' x 8' has a volume of 1728 cubic feet, ( length x width x height). An adjoining open kitchen that is 10' x 12' x 8' has a volume of 960 cubic feet. An adjoining open dining room is 12' x 12' x 8' Vermont Castings Radiance Vent-Free Gas Heater with a volume of 1152 cubic feet. The total space volume is 3840 cubic feet. (1728 + 960 + 1152). 2. Divide the volume of space by 50 cubic feet. The result is the maximum BTU/Hr that the space can support. Example: 3840 divided by 50 = 76.8 or 76,800 BTU/Hr. 3. Add the BTU/Hr ratings of all fuel-burning appliances installed in the same space, including the following: Gas Water Heater Gas Furnace Gas Fireplace Logs Unvented Gas Heater Vented Gas Heater* Other Gas Appliances* * Do not include Direct Vent appliances as these utilize outside air for combustion and vent to the outdoors. Example: Gas Range 55,000 BTU/Hr Unvented Heater +33,000 BTU/Hr Total 88,000 BTU/Hr 4. Compare the maximum BTU/Hr rating the space can support with the total BTU/Hr used by the appliances. Example: 76,800 BTU/Hr - max. the space can support 88,000 BTU/Hr - total used by appliances In this example, the maximum BTU/Hr that the space can support is less than the total used by the appliances, the space is considered to be Confinedspace. Additional air must be provided to meet the requirements of the Unvented heater. A confined space may be ventilated in two ways: A) Open up or provide at least two ventilating grilles to an adjoining unconfined space. Use any of the options illustrated in Figure 4. 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 located within 12" of the ceiling; the other within 12" of the floor. (If the total exceeds 100,000 BTU/Hr, additional grilles will be required.) B) Vent the room directly to the outdoors. (Provide one square inch of opening for each 4,000 BTU/hr. If the total BTU/Hr used by the appliances is less than the maximum BTU/Hr the space is able to support, the room meets the Unconfined space criteria and no further ventilation is required. For further information on ventilation guidelines and sizing specifications follow the National Fuel Gas Code NFPA 54/ANSI Z223.1 Section 5.3. 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. 12” 12” Option 3 - Vents to Adjoining Room Option 1 Vents to Adjoining Room Option 2 - Remove Door to Adjoining Rooms VO370-2 Fig. 4 Vent options to provide additional air. Vermont Castings Radiance Vent-Free Gas Heater Assembly Procedures Read these instructions...

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