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SYSTEMA S.p.A.6 DISCHARGE AND INTAKE DUCTSAIRTIGHT GAS-FIRED RADIANT TUBES INFRAThe discharge ducts may be made using different systems: on the roof (fig.36 and fig.40), on the wall (fig.37 and fig.41), single coaxial (fig.38 and fig. 39) or collective discharge (fig.34) with a suitable electric fan.Two things must be considered in order to make the various connections correctly:1) The radiant tubes are subject to expansion on heating, so they move.2) When they start operating, condensation is formed.To facilitate the creation of the discharge ducts, Systema provides a special flexible part (cod. 00CEEL0600) which alsoacts as an exchanger to lower the temperature of the fumes.6.1 Discharge and intake ducts on the roofThe fumes discharge ducts for type C appliances with a natural or forced draught must comply with the following conditions:... they must be metal, .... made of material suitable to resist long-term normal mechanical stress, heat and theaction of combustion products and of any condensation they may produce.Either a rigid stainless steel tube or a rigid aluminium tube may be used (the latter must be at least 1.5 mm thick).To avoid problems due to relative shifting between theburner and the fumes discharge terminal rigidly fixed tothe roof or to the wall, it is advisable to use the flexiblefumes element available as an accessory.1For the combustion air intake ducts, any type of metaltube may be used.For fumes discharge and air intake, always use rigidmetal tubes with smooth internal surfaces and a minimumdiameter of 100 mm.The maximum length of the fumes and air ducts may beseen in the table on page 34, depending on the modelof appliance.The tubes used and the various connections mustensure an airtight seal with respect to the environmentserved.23KEY1= Discharge chimney2= Female connector Ø 100 mm with cup3= Double layer inox flexible tube Ø 100 mm4= Intake fan flexible coupling4Fig.29 detail of the flexiblecouplingRev. 18GB061030