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• Ensure that the heater is clean when operating. Excessive dust accumulation on the burner and logs will increase the amount of carbon monoxide formation and could lead to carbon monoxide poisoning and death. CODES Adhere to all local codes or in their absence the latest edition of The National Fuel Gas Code ANSI Z223.1 or NFPA54 which can be obtained from The American National Standards Institute, Inc. (1430 Broadway, New York, NY, 10018) or National Fire Protection Association, Inc. (Batterymarch Park, Quincy, MA, 02269). COMBUSTION AND VENTILATION AIR Heaters installed in these appliances shall not be installed in a confined space. Heaters installed in these appliances may be located in unusually tight construction provided the space is unconfined, or if confined, is provided with two permanent openings communicating directly with an additional room(s) of sufficient volume so that the combined volume of all connected spaces meets the criteria for an unconfined space, (National Fuel Gas Code ANSI Z223.1 1992, Section 5.3). Generally 50 ft 3 per 1,000 BTU input of all operating appliances in the space. The National Fuel Gas Code defines a confined space as a space whose volume is less than 50 ft 3 per 1,000 BTU/Hr (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 ft 3 per 1,000 BTU/Hr (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space. 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. Unusually tight construction is defined as construction where: a. wall and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating or one perm or less with openings gasketed or sealed, and b. weather stripping has been added on operable windows and doors, and c. caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall- ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and at other openings. Use the following equations to determine if you have a confined or unconfined space. 1. Determine the volume of space — ft 3. Length x Width x Height = _____ ft 3 (Include adjoining rooms with doorless passageways or ventilation grills between rooms.) Example: 24' (L) x 16' (W) x 8' (H) = 3072 ft 3 2. Divide the volume of space by 50 ft 3 to determine the maximum BTU/Hr the space can support. ______ (volume of space – ft 3)/ 50 ft 3 = (Maximum BTU/Hr the space can support) Example: 3072 ft 3 / 50 ft 3 = 61.44 or 61,440 BTU/Hr the space can support. 3. Add the BTU/Hr of all the fuel burning appliances in the space. Vent-Free heater _______ BTU/Hr Gas appliance #1* _______ BTU/Hr Gas appliance #2 + _______ BTU/Hr Total = _______ BTU/Hr Example: Vent-free heater ...

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