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Diagram 9.18
13225
9 Vertical Flue - Length, Preparation and Installation
9.11 Vertical flue
The vertical flue system is available as an option where the
boiler position does not permit the use of the top horizontal
or rear flue system.
The system is made up from accessories. The accessories
include terminal assembly, bends 45º and 90º, flue
extensions, fixing bracket and appropriate weather collar, see
diagram 9.19.
The maximum permitted straight flue length is 10 metres plus
the terminal. for each 90
o
or 2x45
o
bends fitted, the maximum
length must be reduced by 1 metre, see diagram 9.18.
NOTE: 2x45º bends can replace 1x90º bend if necessary.
When using 90º 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 9.18.
Alternatively use 45º bends to avoid horizontal runs, see (b) in
diagram 9.18.
The terminal 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.
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