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Unusually Tight Constructionis defined as construction wherein: a. Walls and ceilings exposed to the outside atmosphere have a continuous water vapor barrier with a rating of one perm or less, with openings gasketed or sealed, and b. weather stripping has been added on openable windows and doors and c. caulking or sealants are applied to areas such as joints around windows and door frames, between sole plates and floors, between wall and ceiling joints, between wall panels, at penetrations for plumbing, electrical and gas lines and at all other openings. If your home meets all of the above criteria, you must provide additional fresh air for the appliance as detailed on Page 7. If your home does not meet the above criteria, follow the procedure below. Determine If You Have a Confined or Unconfined Space Use the following formula to determine if you have a confined or unconfined space. Spaceis defined as the room in which you will install the heater, plus any adjoining rooms with doorless passageways or ventilation grilles between the rooms. The National Fuel Gas Code defines a confined spaceas a space whose volume is less than 50 cubic feet per 1,000 BTU per hour input rating (4.8m3 per Kw) of the aggregate (total) input rating of all appliances installed in that space and an unconfined spaceas a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8m3 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. 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. 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’ with a volume of 1152 cubic feet. The total volume is 3840 feet. (1728 + 960 + 1152) 2. Divide the volume of space by 50 cubic feet. The result is the maximum BTU/hour the space can support. Example: 3840 cubic feet divided by 50 = 76.8 or 76,800 BTU/hour. 3. Add the BTU/hour ratings of all fuel-burning appliances installed in the same space, including the following: Gas Water Heater Gas Furnace Gas Fireplace Logs Vent-free Gas Heater Vented Gas Heater* Other Gas Appliances* *Do not include Direct-vent appliances as these use outdoor air for combustion and vent to the outdoors. Example: Gas Range 55,000 BTU/hour Vent-free Logset +25,000 BTU/hour Total 80,000 BTU/hour Vermont Castings Jefferson Vent Free Gas Heater 4. Compare the maximum BTU/hour rating the space can support with the total BTU/hour used by the appliances. 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 use...

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