Glow-worm Ultracom cxi - Manual (Page 28)

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Diagram 10.18
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10 Vertical Flue - Length, Preparation and Installation
10.11 Vertical flue
The vertical flue system is available as an option where the
boiler position does not permit the use of the top horizontal
flue system.
The system is made up from accessories. The accessories
include terminal assembly, bends 45º and 87.5º, flue
extensions, fixing bracket and appropriate weather collar, see
diagram 10.19.
The maximum permitted straight flue length is 10 metres
plus the terminal. For each 87.5º or 2x45 o bends fitted, the
maximum length must be reduced by 1 metre, see diagram
10.18.
NOTE: 2x45º bends can replace 1x87.5º bend if necessary.
When using 87.5º bends any horizontal extension pipe should
be inclined by a minimum of 44mm/metre (2.5°) towards
the boiler to facilitate condense removal, see (a) in diagram
10.18.
Alternatively use 45º bends to avoid horizontal runs, see (b) in
diagram 10.18.
The terminal siting should be as shown in diagram 4.2.
Measure the distance of flue length required for the
installation.
The flue must be designed with a continuous fall towards the
boiler.