Desa CGEFP33PRB Owner's Operation And Installation Manual

Also see for CGEFP33NRB: OWNER'S OPERATION AND INSTALLATION MANUAL OWNER'S OPERATION AND INSTALLATION MANUAL

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www.desatech.com111245-01C AIR FOR COMBUSTIONAND VENTILATIONContinued1. 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 18 ft.(width) x 8 ft. (ceiling height) = 2880 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: 2880 cu. ft. (volume of space) x 20 =57,600 (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.Example:Gas water heater ________ Btu/HrVent-free fireplace + ________ Btu/HrTotal = ________ Btu/Hr4. Compare the maximum Btu/Hr the space cansupport with the actual amount of Btu/Hr used._________ Btu/Hr (maximum the space can support)_________ Btu/Hr (actual amount of Btu/Hr used)Example: 57,600 Btu/Hr (maximum the spacecan support)73,000 Btu/Hr (actual amount ofBtu/Hr used)The space in the above example is a confined spacebecause the actual Btu/Hr used is more than the maxi-mum Btu/Hr the space can support. You must provideadditional fresh air. Your options are as follows:A. Rework worksheet, adding the space of an adjoin-ing room. If the extra space provides an unconfinedspace, remove door to adjoining room or addventilation grills between rooms. See VentilationAir From Inside Building.B. Vent room directly to the outdoors. See Ventila-tion Air From Outdoors, page 8.C. Install a lower Btu/Hr fireplace, if lower Btu/Hrsize makes room unconfined.If the actual Btu/Hr used is less than the maximumBtu/Hr the space can support, the space is an un-confined space. You will need no additional freshair ventilation.WARNING: If the area inwhich the fireplace may be oper-ated is smaller than that definedas an unconfined space or if thebuilding is of unusually tightconstruction, provide adequatecombustion and ventilation airby one of the methods describedin the National Fuel Gas Code,ANSI Z223.1/NFPA 54 Section 5.3or applicable local codes.vENTILATION AIRVentilation Air From Inside BuildingThis fresh air would come from an adjoining un-confined space. When ventilating to an adjoiningunconfined space, you must provide two perma-nent openings: one within 12" of the ceiling andone within 12" of the floor on the wall connectingthe two spaces (see options 1 and 2, Figure 3). Youcan also remove door into adjoining room (seeoption 3, Figure 3). Follow the National Fuel GasCode, ANSI Z223.1/NFPA 54, Section 5.3, Air forCombustion and Ventilation for required size ofventilation grills or ducts.40,00033,00073,000Figure 3 - Ventilation Air from InsideBuildingOrRemoveDoor intoAdjoiningRoom,Option3Ventilation GrillsInto Adjoining Room,Option 2VentilationGrillsInto AdjoiningRoom,Option 112"12"