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Hersteller: Monessen Hearth Dateigröße: 1 mb Dateiname: Unterrichtssprache:

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.) 3 Example: 20' (L) x 16' (W) x 8' (H) = 2560 ft 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: 2560 ft 3 / 50 ft 3 = 51.2 or 51,200 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: VF4000 Vent-free heater 25,000 BTU/Hr Gas appliance #1 34,000 BTU/Hr (water heater) Total = 59,000 BTU/Hr * Do not include direct-vent gas appliances. Direct-vent is sealed combustion and draws combustion air from the outdoors. 4. Compare the maximum BTU/Hr the space can support with the actual amount of BTU/ Hr used. _________ BTU/Hr (max. the space can support) _________ BTU/Hr (actual amount of BTU/Hr used) Example: 51,200 BTU/Hr (max. the space can support) 59,000 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. WARNING: IF THE AREA IN WHICH THEHEATER MAY BE OPERATED IS SMALLERTHAN THAT DEFINED AS AN UNCON- FINED SPACE, PROVIDE ADEQUATECOMBUSTION AND VENTILATION AIR BYONE OF THE METHODS DESCRIBED INTHE NATIONAL FUEL GAS CODE, ANSIZ223.1 1992, SECTION 5.3 OR APPLI- CABLE LOCAL CODES. Your options are: a. Rework equations adding the space of adjoining room(s). If the extra volume provides an unconfined space, then remove door or add ventilation grills between rooms. Refer to National Fuel Gas Code, ANSI Z223.1 1992, Section 5.3. b. Vent room directly to the outdoors. Refer to National Fuel Gas Code, ANSI Z223.1 1992, Section 5.3. c. Install a lower BTU/Hr heater, to make the area an unconfined space. If the actual BTU/Hr used is less than the maximum BTU/Hr the space can support, then the space is an unconfined space. You will need no additional fresh air ventilation for an unconfined space. LOCATION OF FIREPLACE Carefully select the best location for installation of your VF4000 series Unvented Room He...

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