23
ASSEMBLING THE FLUE
Flue terminals or extension ducts may be cut to shorter lengths
if required. When cutting a duct ensure it is square by marking
the length all the way around and only cut back the plain end.
When cutting concentric duct it is important that the inner duct is
maintained at 20mm longer than the outer duct to allow correct
connection of the ducts. Care should be taken to support the
inner duct when cutting the ue.
Note. Horizontal ue runs must be angled down between
1.5
o
- 3
o
towards the boiler to allow the condensate to drain.
For this reason it is recommended that a support bracket is
used for every 1m of extension pipe.
Care must be taken when assembling ues, not to damage
the seals.
See below for ue assembly examples.
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