User guide

25
Standard Horizontal Flue
9.6 Flue Length
The maximum permissable horizontal ue length is 5.6 metres
for Betacom 24c and 4.6 metres for Betacom 30c, this can be
achieved by use of the accessories, see diagram 9.12.
However should additional 90º or 2 x 45º elbows be used then
the length MUST be reduced by 1 metre.
The diagram 9.10 shows the length achievable by using the
kit A2043400.
When extension pipes are used the ue 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 condensate drain.
The ue can be installed from inside the building, when
access to the outside wall face is not practicable.
9 Standard Flue - Length, Preparation and Installation
Diagram 9.10
202.5
477.5mm
477.5mm
202.5
20mm
15533
14475