Technical data
Procon
. C F P L
The excess pressure available from the boiler fan for overcoming the frictional resistance of the ue system is
Pa. The adjacent table lists the resistances of the ue components, which will assist the designer in calculat-
ing the resistance of the total ue system.
As with all vertical ue systems, thermal up-draught is generated in the vertical sections of a ue, the graph
below ( g .) shows the Thermal Up-draught generated, in Pa’s, which can then be deducted from the total
ue resistance.
If the resistance of the total ue system exceeds Pa’s, this will result in a reduction of the boiler output.
The graph below ( g .) shows the available maximum boiler output in relation to ue resistance.
15H 25H 45H 75H
Concentric Flue Components
Standard Wall Terminal . . . .
Vertical Discharge Wall Terminal . . . .
Vertical Terminal . . . .
mm Flue Extension . . . .
mm Flue Extension . . . .
° Bend . . . .
° Bend . . . .
mm ∅ PPS Flue Components
Concentric to Twin Pipe Adapter . . . .
Exhaust Pipe Terminal . . . .
Air Pipe Terminal . . . .
mm Flue Extension . . . .
mm Flue Extension . . . .
° Bend . . . .
° Bend . . . .
ermal Up-draught Graph Boiler Output / Flue Resistance Graph
Fig .a – Thermal Up-draught when ue gas
temperature ºC and outside temperature -° C.
A = Flue insulated or within the building.
B = Flue un-insulated and exterior to the
building.
Fig .b – E ect of the ue system
resistance on the boiler output.