page 14e) if the appliance is installed under a window orunder a shelf, make sure that the sill or theshelf does not obstruct the flow of warm air;it is recommended that a distance of at least20 cm is maintained. For this reason and tomake maintenance easier, the air heatershould not be installed inside niches or inpositions where it is difficult to access. Theclearances indicated in fig. 11 should beobserved.4.2 AIR INTAKE AND FLUE EXHAUST DUCTSWARNING! The material used to build theexternal wall and any covering (wood, plastic)must not be sensitive to the heat generatedby the flue gas exhaust duct. If it is heatsensitive, the passage hole must beprotected with insulation that insulates thewall or the covering.4.2.1 Type definitionAs already mentioned in point 1.1, the Ghibli airheater can be installed with different configurationsof the air intake and combustion product exhaustduct(s) and these different solutions constitutethe definition of "type" according to the currentstandards:- Type C12 (standard supply)The combustion circuit is hermetically sealedwith respect to the environment in which the airheater is installed. The intake/exhaust ductpasses directly through the external wall of theroom. This is the standard configuration supplied(fig. 12).- Typr C52 (with accessories on request)The combustion circuit is sealed with respect tothe environment in which the air heater is installed.The ducts are separated and both are connectedto the outdoors, but their terminals need not beadjacent to each other (fig. 13).WARNING! Also in the second solution (TypeC52), the intake and exhaust ducts, includingthe relative accessories, are considered bythe standards to be integral parts of the airheater. Therefore, they must be requestedfrom the manufacturer.In both the cases described above the length ofthe ducts must always respect the limits indicatedin the next point.Fig. 12TYPE C12 INSTALLATION(standard supply)Air intake / flue gasexhaust ductExternal terminalFig. 10POSIZIONAMENTO10-15 cmmin. 20 cmMINIMUM MAINTENANCE DISTANCESFig. 11TOP VIEW60 cm 30 cm