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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 uncon fined space. *Adjoining rooms are communication only if there are doorless passageways or ventilation grills between them. DETERMINING THE TYPE OF HEATER LOCATION SPACE: Use this method to determine if you have a confined or unconfined space. Note: the space includes the room in which you install heater plus any adjoining rooms with door- less passageways or ventilation grills between the rooms. 1. Find the volume of the space by multiplying room length x width x height. Example: Space size 18ft (length) x 18ft. (width) x 8ft. (height) = 2592 If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these rooms to the total volume of the space. 2. Divide the space volume by 50 cubic feet to determine the maximum Btu/hr the space can support. Example: 2592 cu.ft. (volume of space) / 50 cu.ft. = 51.8 or 51,800 (maximum Btu/hr the space can support) WARNING: If the area in which the heater may be operated is smaller than defined as an unconfined space or if the building is of unusually tight con struction, provide adequate combustion and ventila tion air by the methods described in the National Fuel Gas Code, NFPA 54/ ANSI Z223.1, Section 5.3 or applicable local codes. 3. Add the Btu/hr of all the fuel-burning appliances in the space such as, Vent–free heater, Gas water Unvented Liquid Propane Fired Room Heater 4 Installation Instructions and Owner’s Manual Unvented Liquid Propane Fired Room Heater 5 Installation Instructions and Owner’s Manual attics* and crawl spaces. Follow the National Fuel Gas Code NFPA 54/ ANSI Z223.1, 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 into attic. If attic has a thermostat-controlled power vent, heated air entering the attic will activate the power vent. IMPORTANT: Vent-free heaters add moisture to the air. Although this is beneficial, installing heater in rooms without enough ventilation air may cause mildew to form from too much moisture. See Fresh Air for Combustion and Ventilation, pages 3 through 5.INSTALLATION NOTICE: This heater is intended for the use as supplemental heat. Use this heater along with your primary heating system. Do not install this heater as your primary heat source. If you have a central heating system, you may run system’s circulating blower while using heater. This will help circulate the heat throughout the house. In the event of a power outage, you can use this heater as your primary heat source for the duration of the outage.heater, Gas furnace, Vented gas heater, Gas fireplace logs, and Other gas appli...

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