Desa GVB35N Owner's Operation And Installation Manual

Desa GVB35N Owner's Operation And Installation Manual Manual pdf 19 page image

19100353FRESH AIR FORCOMBUSTIONANDVENTILATIONContinuedExample 2: Locating Heater in Confined (Closed) AreaNOTICEA confined area has an air volume of less than 50 cubicfeet for each 1000 BTU/Hr input rating of all appliancesin the area (cubic feet equals length x width x height ofarea). Include adjoining rooms only if there are no doorsbetween the rooms.If you install this heater in a confined area, you must provide additional fresh air.Ventilating Confined AreaThis fresh air would come from an adjoining open area or outdoors.WARNINGThe adjoining open area must have enough fresh,outside air ventilation to supply any appliance in thatarea plus the confined area. Follow instructions underExample 1: Locating Heater in Unconfined (Open) Area,page 17 to make sure fresh air ventilation is adequate.When ventilating to an adjoining open area, you must provide two permanentopenings: one within 12" of the ceiling and one within 12" of the floor on the wallconnecting the two areas. Follow the National Fuel Gas Code NFPA 54/ANSIZ223.1. It lists fresh-air requirements for fuel-burning appliances.VentilationGrills intoCloset forHot WaterHeaterRecommendedFresh Air Ductinto Crawl Space inFurnace Area or inCloset with Water HeaterVentilation GrillsConnecting Two Roomsto Meet Unconfined Space12"12"Figure 15 - Ventilation Air from Inside BuildingAfter providing ventilation between rooms, check for draft hood spillage (see DraftHood Spillage Test, page 17). If draft hood spillage still occurs, provide moreventilation between rooms or provide permanent ventilation from outdoors. SeeProviding Permanent Fresh-Air Ventilation, page 18.