14The table below provides specific data foreach heater model as -2.5 Flue Installation.The VRABD heater range is suitable for thefollowing flue optionsC32 C 12 B22An integral flue spigot is fitted to all VarianteAir Heaters thereby allowing the flue toconnect directly to the heater.The design of the flue must ensure that itcan be disconnected to allow for cleaningand servicing.All joints should be sealed between thesections.WarningIt is essential that the products ofcombustion are flued to the outside of thebuilding.Each heater must have its own separateflue, with a flue diameter of not less than isdetailed in section 7.2 within this manual.WARNINGOn VRABD 75 to 145 a Combustion AirPlate is supplied as standard this MUSTbe fitted in place of the combustion airspigot if the heater is to be installed inthe flue only optionThe flue assembly must comply with all therelevant regulations regarding height andmaterials, and must terminate with anapproved flue terminal.Care should be taken to ensure that the flueterminal is not situated in a high pressurearea, the proximity of buildings and otherobstacles which will influence this must betaken into account, preferably at the designstage.All Variante Heaters are equipped with abuilt in flue venter fan which prevents the recirculation of combustion products,consequently an external draught diverter,barometric damper, or anti spillage systemmust not be installed. Such devices areunnecessary on the VRABD range ofheaters.Horizontal flue installations: Distancefrom heater connection to terminal mustnot exceed the following length-Mechanical VentilationRate for Plant Room orEnclosureM3/h72 32795 436120 543145 652MODEL