SECTION 8: A IR SUPPLY17 of 55SECTION 8: AIR SUPPLY8.1 Separated Combustion InstallationWhen installed as a separated combustion heater(UHD[T][M][X]S[R]), the air for combustion is drawnin from outside the building.8.2 Building VentilationWhere ventilation is required, air must be taken froman outside point where it is not likely to becontaminated or obstructed.8.3 Outside Combustion Air SupplyIf outside combustion air supply is required,separated combustion model (UHD[T][M][X]S[R])heaters must be used.Caution: If the building has a slight negativepressure or corrosive contaminants such ashalogenated hydrocarbons are present in the air, anoutside combustion air supply to the heater isrequired. Seal all combustion air pipe joints.The outside air terminal must not be more than 1'(31 cm) above the vent terminal.8.3.1 Length RequirementsFollow the constraints listed on Page 12, Section 7.5.WARNINGExplosion HazardEquipment must have access touncontaminated air at all times.Failure to follow these instructions can resultin death, injury or property damage.
