Desa LMFP33NR(A) Owner's Operation And Installation Manual

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Desa LMFP33NR(A) Owner's Operation And Installation Manual Manual pdf 6 page image

www.desatech.com 111604-01H6PROVIDING ADEQUATEVENTILATIONThe following are excerpts from National FuelGas Code, ANSI Z223.1/NFPA 54, Section 5.3,Air for Combustion and Ventilation.All spaces in homes fall into one of the three fol-lowing ventilation classifications:1. Unusually Tight Construction2. Unconfined Space3. Confined SpaceThe information on pages 5 through 7 will helpyou classify your space and provide adequateventilation.Unusually Tight ConstructionThe air that leaks around doors and windowsmay provide enough fresh air for combustion andventilation. However, in buildings of unusuallytight construction, you must provide additionalfresh air.Unusually tight construction is defined asconstruction where:a. walls and ceilings exposed to the out-side atmosphere have a continuouswater vapor retarder with a rating of oneperm (6 x 10 -11 kg per pa-sec-m 2 ) or lesswith openings gasketed or sealed andb. weather stripping has been added onopenable windows and doors andc. caulking or sealants are applied toareas such as joints around windowand door frames, between sole platesand floors, between wall-ceiling joints,between wall panels, at penetrations forplumbing, electrical, and gas lines, andat other openings.If your home meets all of the three criteriaabove, you must provide additional freshair. See Ventilation Air From Outdoors,page 7.If your home does not meet all of the threecriteria above, proceed to DeterminingFresh-Air Flow For Heater Location.Confined and Unconfined SpaceThe National Fuel Gas Code, ANSI Z223.1/NFPA54 defines a confined space as a space whose vol-ume is less than 50 cubic feet per 1,000 Btu per hour(4.8 m3 per kw) of the aggregate input rating of allappliances installed in that space and an unconfinedspace as a space whose volume is not less than 50cubic feet per 1,000 Btu per hour (4.8 m 3 per kw) ofthe aggregate input rating of all appliances installedin that space. Rooms communicating directly withthe space in which the appliances are installed*,through openings not furnished with doors, areconsidered a part of the unconfined space.* Adjoining rooms are communicating only ifthere are doorless passageways or ventilation grillsbetween them.DETERMINING FRESH-AIR FLOWFOR FIREPLACE LOCATIONDetermining if You Have a Confined orUnconfined SpaceUse this work sheet to determine if you have aconfined or unconfined space.Space: Includes the room in which you will installfireplace plus any adjoining rooms with doorless pas-sageways or ventilation grills between the rooms.1. Determine the volume of the space (length xwidth x height).Length x Width x Height =__________cu. ft.(volume of space)Example: Space size 20 ft. (length) x 16 ft.(width) x 8 ft. (ceiling height) = 2,560 cu. ft.(volume of space)If additional ventilation to adjoining room issupplied with grills or openings, add the volumeof these rooms to the total volume of the space.2. Multiply the space volume by 20 to determinethe maximum Btu/Hr the space can support.__________ (volume of space) x 20 = (Maxi-mum Btu/Hr the space can support)Example: 2,560 cu. ft. (volume of space) x 20 =51,200 (maximum Btu/Hr the space can support)3. Add the Btu/Hr of all fuel burning appliances inthe space.Vent-free fireplace __________ Btu/HrGas water heater* __________ Btu/HrGas furnace __________ Btu/HrVented gas heater __________ Btu/HrGas fireplace logs __________ Btu/HrOther gas appliances* + ________ Btu/HrTotal = ________ Btu/Hr* Do not include direct-vent gas appliances. Di-rect-vent draws combustion air from the outdoorsand vents to the outdoors.AIR FOR COMBUSTIONAND VENTILATIONContinued