Glow-worm Ultrapower sxi Series Installation And Servicing page 27

10 Standard Flue - Length, Preparation and Installation
10.6 Flue Length
The maximum achievable rear and side flue length for a
standard flue, diagram 10.12, is as shown in diagram 10.11.
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 10.13, however should
additional 90 o or 2 x 45 o elbows be used then the length
MUST be reduced by 1metre.
Standard Horizontal Flue
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 - 334mm
RH - 547mm
Min. distance from outside
wall face to min clearance.
LH - 75mm
RH - 75mm
87min
OUTSIDE
WALL
FACE
87min
A
OUTSIDE
WALL FACE
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.
75 min. to 586 max.
81
WALL THICKNESS
145
INSIDE
WALL
Max flue length 733mm
5mm
min.
clearance
A
INTERNAL
SURFACE
27
FLUE
C
L
455
C
L
FLUE
394 181
Diagram 10.11