14operation should mechanical airsupply fail for any reasonThe table below provides specific data foreach heater model as -2.5 Flue Installation.An 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 VRA/C 60 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 there-circulation of combustion products,consequently an external draught diverter,barometric damper, or anti spillage systemmust not be installed. Such devices areunnecessary on the BVA/C range ofheaters.Horizontal flue installations: Distancefrom heater connection to terminal mustnot exceed the following length-MODELMechanical VentilationRate for Plant Room orEnclosureM3/h12 5420 8830 13342 17750 22160 26572 32795 436120 543145 652