23
10.1 Flue Length
The maximum achievable rear and side flue length for a
telescopic flue, diagram 10.2, is as shown in diagram 10.1.
The maximum permissable horizontal flue length is 8 metres
plus the flue terminal assembly, this can be achieved by
use of the accessories, see diagram 10.3, however should
additional 90
o
or 2 x 45
o
elbows be used then the length
MUST be reduced by 1metre.
13339
10 Telescopic Flue - Length, Preparation and Installation
When extension pipes are used the flue system must be
designed to have a continuous fall to the boiler of at least 2.5
o
44mm/metre to allow condensate to run back into the boiler
and out via the condense trap & siphonic drain.
The flue can be installed from inside the building, when
access to the outside wall face is not practicable.
The diagrams below describe the lengths achievable without
the use of extensions or elbows.
Horizontal Telescopic Flue
Diagram 10.1
13337
L
FLUE
C
Max flue length 668mm
181394
5mm
min.
clearance
A
OUTSIDE
WALL FACE
87min
NOTE. If necessary, it is
permitted to increase this
dimension to 600mm max.
INTERNAL
SURFACE
Max. distance from outside
wall face to min clearance.
LH - 269mm
RH - 482mm
Min. distance from outside
wall face to min clearance.
LH - 75mm
RH - 75mm
A
320 min. to 523 max.
WALL THICKNESS
87min
NOTE. If necessary, it is
permitted to increase this
dimension to 600mm max.
455145
OUTSIDE
WALL
FACE
INSIDE
WALL
L
FLUE
C
81
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