Owner manual

24
10 Standard Flue - Length, Preparation and Installation
Diagram 10.11
14015
14006
Standard Horizontal Flue
10.6 Flue Length
The maximum permissable horizontal ue length is 8 metres
plus the ue 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.
The diagram 10.11 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.
Multiple Boiler Chimney Flue Length
The ue length must be calculated and installed according to
the relevant standards EN 13384-1 and 2 (C43 ue systems
only) with reference to the table below and the manufacturers
instructions supplied.
The appliance maximum ue length must be included when
calculating the overall design of the ue system.
NOTE: The horizontal ue terminal must be removed, see
diagram 10.12.
Flexicom
12hx
Flexicom
15hx
Flexicom
18hx
Flexicom
24hx
Flexicom
30hx
Flexicom
35hx
Exhaust mass rate (g/s)
At Min Thermal
Load (40C°/30°C)
4.30 4.30 4.30 4.30 4.30 4.30
At Max Thermal
Load (80C°/60°C)
5.54 6.91 8.33 11.17 14.10 16.39
Exhaust temperature (ºC)
At Min Thermal
Load (40C°/30°C)
33.2 33.2 33.2 33.2 33.2 36.0
At Max Thermal
Load (80C°/60°C)
55.8 58.3 63.0 73.3 87.4 84.0