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SYSTEMA S.p.A.SlopeAIRTIGHT GAS-FIRED RADIANT TUBES INFRAIMPORTANTWhen a fairly long drainageduct is made (over 2 mt), adouble curve must be madewith a slope towards the end(see fig. 31); in this way thecondensate that forms onstarting when the plant iscold is deposited in thesiphon; when the plant reachessteady operation, thiscondensate heats up andevaporates.Fig. 316.1.1 Coaxial discharge and intake ducts on the roofAirintake1 2FumesoutletProtectioncapSplitterAirFumes1= Insert the concentric discharge/intake inthe splitter.2= Fix the splitter to the end by means ofthe collar; connect the discharge duct tothe coupling below the splitter (secure itwith the collar) and the intake duct to thecoupling at the side.3= Connect the discharge and intake ductsto the appliance.4= In certain cases there is the possibility ofhanging the splitter on the ceiling withmetal rods or chains.3 4Fig.32 coaxial discharge on the roofRev. 18GB061032