Desa EFS33NRB Owner's Operation And Installation Manual

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www.desatech.com 113132-01A6AIR FOR COMBUSTIONAND VENTILATIONContinuedPROVIDING ADEQUATEVENTILATIONThe following are excerpts from National FuelGas Code, ANSI Z223.1/NFPA 54, Section 5.3, Airfor 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 help youclassify your space and provide adequate ventilation.Unusually Tight ConstructionThe air that leaks around doors and windows mayprovide enough fresh air for combustion and ven-tilation. However, in buildings of unusually tightconstruction, you must provide additional fresh 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-m2 ) or lesswith openings gasketed or sealedandb. weather stripping has been added onopenable windows and doorsandc. caulking or sealants are applied to ar-eas such as joints around window anddoor frames, between sole plates andfloors, between wall-ceiling joints, be-tween 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 fresh air.SeeVentilation Air From Outdoors, page 7.If your home does not meet all of the threecriteria above, proceed toDeterminingFresh-Air Flow For Heater Location.Confined and Unconfined SpaceThe National Fuel Gas Code, ANSI Z223.1/NFPA 54 defines a confined space as a spacewhose volume is less than 50 cubic feet per 1,000Btu per hour (4.8 m3 per kw) of the aggregate in-put rating of all appliances installed in that spaceand an unconfined space as a space whose vol-ume is not less than 50 cubic feet per 1,000 Btuper hour (4.8 m 3 per kw) of the aggregate inputrating of all appliances installed in that space.Rooms communicating directly with the space inwhich the appliances are installed*, through open-ings not furnished with doors, are considered apart of the unconfined space.* Adjoining rooms are communicating only if thereare doorless passageways or ventilation grills be-tween 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. (vol-ume of space)If additional ventilation to adjoining room is sup-plied with grills or openings, add the volume ofthese 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.While it is good to make your home energy effi-cient, your home needs to breathe. Fresh air mustenter your home. All fuel-burning appliances needfresh air for proper combustion and ventilation.Exhaust fans, fireplaces, clothes dryers, and fuelburning appliances draw air from the house tooperate. You must provide adequate fresh air forthese appliances. This will insure proper ventingof vented fuel-burning appliances.