Desa FPVF33NRA Owner's Operation And Installation Manual

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110148-01BFor more information, visit www.desatech.comFor more information, visit www.desatech.com6AIR FOR COMBUSTION ANDVENTILATIONContinuedVENTILATION AIRVentilation Air From Inside BuildingThis fresh air would come from an adjoining unconfined space.When ventilating to an adjoining unconfined space, you mustprovide two permanent openings: one within 12" of the ceiling andone within 12" of the floor on the wall connecting the two spaces(see options 1 and 2, Figure 2). You can also remove door intoadjoining room (see option 3, Figure 2). Follow the National FuelGas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustionand Ventilation for required size of ventilation grills or ducts.Ventilation Air From OutdoorsProvide extra fresh air by using ventilation grills or ducts. You mustprovide two permanent openings: one within 12" of the ceiling andone within 12" of the floor. Connect these items directly to theoutdoors or spaces open to the outdoors. These spaces include atticsand crawl spaces. Follow the National Fuel Gas Code, ANSIZ223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilationfor required size of ventilation grills or ducts.IMPORTANT: Do not provide openings for inlet or outlet air intoattic if attic has a thermostat-controlled power vent. Heated airentering the attic will activate the power vent.AIR FOR COMBUSTION AND VENTILATIONDetermining Fresh-Air Flow for Heater Location (Cont.)Ventilation AirFigure 4 - Ventilation Air from Outdoors (FPVF33PRA Shown)Figure 3 - Ventilation Air from Inside Building (FPVF33PRAShown)OutletAirVentilatedAtticOutletAirInletAirInlet Air VentilatedCrawl SpaceToCrawlSpaceTo AtticOrRemoveDoor intoAdjoiningRoom,Option3Ventilation GrillsInto Adjoining Room,Option 2VentilationGrillsInto AdjoiningRoom,Option 112"12"WARNING: If the area in which the heater may beoperated is smaller than that defined as an uncon-fined space or if the building is of unusually tightconstruction, provide adequate combustion and ven-tilation air by one of the methods described in theNational Fuel Gas Code, ANSI Z223.1/NFPA 54 Sec-tion 5.3 or applicable local codes.The space in the example on page 5 is a confined space because the actualBtu/Hr used is more than the maximum Btu/Hr the space can support. Youmust provide additional fresh air. Your options are as follows:A. Rework worksheet, adding the space of an adjoining room. If theextra space provides an unconfined space, remove door to adjoiningroom or add ventilation grills between rooms. See Ventilation Air FromInside Building.B. Vent room directly to the outdoors. See Ventilation Air From Outdoors.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.