Stimmen - 5, Durchschnittliche Bewertung: 4.6
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Anleitung Zusammenfassung
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. “WARNING: IF THE AREA IN WHICH THE HEATER MAY BE OPERATED IS SMALLER THAN THAT DEFINED AS AN UNCONFINED SPACE OR IF THE BUILDING IS OF UNUSUALLY TIGHT CONSTRUCTION, PROVIDE ADEQUATE COMBUSTION AND VENTILATION AIR BY ONE OF THE METHODS DESCRIBED IN THE NATIONAL FUEL GAS CODE, ANSI Z223.1/ NFPA 54, SECTION 5.3 OR APPLICABLE LOCAL CODES.” Unusually tight construction is defined as construction where: a) Walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of 1 perm (6 x 10-11 kg per pa-sec-m2) or less with openings gasketed or sealed; b) Weather stripping has been added on openable 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. NOTE: SOME AREAS IN THE UNITED STATES HAVE HIGHER REQUIREMENTS FOR CUBIC FEET PER 1000 BTU/ HOUR INPUT. (EX. CINCINNATI, OHIO CODES REQUIRE 70 CUBIC FEET). CHECK YOUR LOCAL CODE BEFORE INSTALLATION. Page 13 DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION DETERMINE IF YOU HAVE A CONFINED OR UNCONFINED SPACE Use this worksheet to determine if you have confined or unconfined space. SPACE: Includes the room in which you will install heater plus adjoining rooms with doorless passageways or ventilation grills between the rooms. 1. Determine the volume of the space (length x width x height). Length x Width x Height =_________cu.ft.(volume of space) EXAMPLE: 20 ft.(Length) x 16 ft.(Width) x 8 ft.(ceiling Height)= 2560 cu. ft. (volume of space) 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. _________(volume of space)/50 cu. ft. =maximum BTU/Hr the space can support) EXAMPLE: 2560 cu. ft. (volume of space /50 cu. Ft .= 51.2 or 51200 (maximum BTU/Hr the space can support) 3. Add the BTU/Hr of all fuel burning appliances in the space. Vent-free heater _______________BTU/Hr Gas water heater* _______________BTU/Hr Gas furnace _______________BTU/Hr Vented gas heater _______________BTU/Hr Gas fireplace logs _______________BTU/Hr Other gas appliances* + _______________BTU/Hr Total = _______________BTU/Hr Example: Gas water heater 40000 BTU/Hr Vent-free heater + 18000 BTU/Hr Total = 58000 BTU/Hr *Does not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors. 4. Compare the maximum BTU/Hr the space can support with the actual amount of BTU/Hr used. ____________BTU/Hr (maximum the space can support) ____________BTU/Hr (actual amount of BTU/Hr used) Example: 51200 BTU/Hr (maximum the space can support) 58000 BTU/Hr (actual amount of BTU/Hr used) The space in the above example is a confined space because the actual BTU/Hr used is more than the maximum BTU/Hr the space can support. You must provide additional fresh air. Your options are as follows: Page 14 VENTILATION AIR VENTILATION AIR FROM INSIDE BUILDING This fresh air would come from an adjoining unconfined space. When venting to an adjoining space, you must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor on the wall connecting the two spaces. (See Options 1 and 2 ) You can also remove door into adjoining room. (See Option 3 ) WARNING REWORK WORKSHEET, ADDING THE SPACE OF THE ADJOINING UNCONFINED SPACE. THE COMBINED SPACES MUST HAVE ENOUGH FRESH AIR TO SUPPLY ALL APPLIANCES IN BOTH SPACES. NOTE: Each opening shall have a minimum free area of 1 square inch per 1000 BTU’s per hour of the total input ratings of all gas utilization equipment in the confined space, but not less than 100 square inches. Figure 6 Ventilation Air From Inside Building A. Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoining room or add ventilation grills between rooms. See “Ventilation Air From Inside Building”, figure 6. B. Vent room directly to the outdoors. See “Ventilation Air From Outdoors”, page 16. C. Install a lower BTU/Hr heater, if lower BTU/Hr size makes room unconfined. If the actual BTU/Hr used is less than the maximum BTU/Hr the space can support, the space is an unconfined space. You will need no additional fresh air ventilation. WARNING: YOU MUST PROVIDE ADDITIONAL VENTILATION AIR IN A CONFINED SPACE Page 15 VENTILATION AIR FROM OUTDOORS Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor. Connect these items directly to the outdoors. T...