termovana Stella Installation, Maintenance And User Manual page 12

Types of coaxial flue systems
The L value of maximum performance, indicated in the chart, includes the flue/ air duct and it also
includes a curve for coaxial systems.
The C52 types must comply with the following indications:
1- The inlet and flue ducts must have the same diameter (• 80 mm).
2- When attaching the curve to the inlet and/ or flue systems, the performance calculation
must include the equivalent length for each system.
3-
The flue duct must protrude at least 0.5 m from the rooftop when it is located on the side
opposite to the inlet duct (this is not compulsory when the flue and the inlet ducts are on
the same side of the building).
A 39-mm diaphragm can be used with this twin system to discharge fumes up to a
distance of 8 metres.
metres and up to a maximum of 42 metres.
Remember that a small radius 90º bend is equivalent to a 1.8 m pipe run.
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These diagrams show examples of several types of coaxial or
twin flue ducts.
For further information on discharge/ inlet accessories, refer to
the Fume Catalogue.
The diaphragm must be removed if the distance exceeds 8
Types of twin flue systems