34BALANCED FLBALANCED FLBALANCED FLBALANCED FLBALANCED FLUE 9UE 9UE 9UE 9UE 99-3 Burner Air Supply9-3.1 Combustion Air SupplyBoiler in room.No combustion air inlet is required.Boiler in compartment/small room.Ventilation air supply is required as shown in fig. 9-3a.OFTECINFORMATION SUPPLIED BY OFTEC.FOR FURTHER INFORMATIONCONSULT THE LOCAL BUILDINGCONTROL.VENTED FROM OUTSIDE VENTED FROM ROOMFig. 9-3a Ventilation Air Supply for Balanced Flues in Compartments9-3.2 Burner Air DuctAll Floor Standing Boilers are supplied with an adaptor and flexible air duct fitted forconventional flue connection.For balanced flue applications, the conventional flue adaptor has to be removed, the airduct is then reconnected to the balanced flue.Internal Wall Mounted Boilers are supplied with the flexible air duct ready to connect to abalanced flue.Always inspect the condition of the air duct during routine maintenance and replace if itis not air sealed.REMOVE ADAPTORFig. 9-3b AdaptorFLEXIBLE AIR DUCTFig. 9-3c Air Duct - Floor Standing Fig. 9-3d Air Duct - Wall MountedFLEXIBLE AIR DUCT99999NOT 190/240 & 240/270