Glow-worm Ultrapower sxi Range - Manual (Page 27)

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Standard Horizontal Flue
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 permissible 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 87.5o or 2 x 45o elbows be used then the length
MUST be reduced by 1metre.
When extension pipes are used the flue system must be
designed to have a continuous fall to the boiler of at least 2.5o
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.
10 Standard Flue - Length, Preparation and Installation
Diagram 10.11
75 min. to 586 max.
WALL THICKNESS
87min
NOTE. If necessary, it is
permitted to increase this
dimension to 600mm max.
455 145 OUTSIDE
WALL
FACE
INSIDE
WALL
L
FLUE
C
81
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
A
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