Glow-worm Ultrapower sxi Series Installation And Servicing page 23

10 Telescopic Flue - Length, Preparation and Installation
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.
NOTE. If necessary, it is
permitted to increase this
dimension to 600mm max.
NOTE. If necessary, it is
permitted to increase this
dimension to 600mm max.
Max. distance from outside
wall face to min clearance.
LH - 269mm
RH - 482mm
Min. distance from outside
wall face to min clearance.
Horizontal Telescopic Flue
A
LH - 75mm
RH - 75mm
When extension pipes are used the flue system must be
designed to have a continuous fall to the boiler of at least 2.5
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.
320 min. to 523 max.
WALL THICKNESS
87min
OUTSIDE INSIDE
WALL
WALL
FACE
87min Max flue length 668mm
5mm
min.
clearance
A
INTERNAL
SURFACE
OUTSIDE
WALL FACE
23
81
FLUE
C
L
145 455
C
L
FLUE
394
Diagram 10.1
o
181