Glow-worm Betacom C - Manual (Page 33)

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9 Twin Flue - Length, Preparation and Installation
9.16 Twin flue
The twin flue system is available as an option when the top
horizontal or vertical flue system is not appropriate.
The system can provide an independent horizontal air inlet
and flue outlet, horizontal air inlet and vertical flue outlet or
vertical air inlet and flue outlet via a concentric terminal.
The system is made up from accessories, see diagram 9.25.
NOTE: The air and flue outlets do not have to be equal
lengths. 2x45º bends can replace 1x90º bend if necessary.
The maximum permitted combined (air inlet + flue outlet) flue
length is 14,3 metres for Betacom 24C, 11,9 metres for
maximum flue length must be reduced by 1 metre, see
diagram 9.24.
NOTE: When using 90º bends any horizontal run should be
inclined by a minimum of 44mm/metre (2.5º) towards the
boiler to facilitate condense removal.
Alternatively use 45º bends to avoid horizontal runs in the flue
pipe.
9.17 Terminal Position
The clearances for a flue outlet are given in the "Flue Location
and Ventilation" section.
In addition the horizontal air inlet must not be closer than 300
mm from a flue outlet on the same wall or 1200mm from an
opposing flue outlet.
9.18 Installation Details
The parts available for a twin flue system installation are
shown in diagram 9.25.
Diagram 9.25
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