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1. Flue Systems
1.1 Flue information and guidelines
Requirements and regulations
Regulations for the construction of flue gas systems are very different for each country. It should
be ensured that all national regulations with regards to flue gas systems are respected.
Pay attention to the following recommendations when dimensioning a flue gas system.

The flue gas system must be properly calculated to ensure safe operation of the system.

Flue gas system components should be removable for maintenance purposes.

Horizontal flue sections must have an incline of no less than 3° back towards the boiler.

Only materials which are heat resistant, resistant to flue gases and aggressive condensate
and also CE approved may be used.

It is the responsibility of the installer to ensure the integrity of the flue and/or chimney
system before commissioning the boiler.

Any terminal that is less than 2 metres above finished floor or ground level must be
guarded. This also applies when terminals are positioned above flat roofs and balconies to
where there is regular unimpeded access. Please see IGEM-UP10 section for more
information on termination.
Please contact Elco UK office for more information for configurations.
1.2 Open flue systems
Open flue systems can be designed where the combustion air supply
is taken from the room or from the surrounding area where the boiler
is installed.
The flue combustion gases are taken from the boiler and terminated
at a higher level to the air intake or a different termination location to
avoid contaminating the air supply with the flue gas. Elco recommend
that single wall plastic flue pipe (PPs) be used for open flue systems.
When designing a flue gas pipe, please ensure that the horizontal
lengths have a 3° fall towards the boiler to aid in any condensate
draining. It is not necessary to make a separate condensate drain in
the flue gas system as the condensate will be drained via the boiler
syphon.
In addition to this, we also recommend that flue brackets are used at 1 metre increments to support
the flue pipe installation. The flue pipe should also be designed to be as straight as possible to
utilise the maximum length of the flue that the boiler can run. If a bend is unavoidable, we advise
that 90° bends not be installed directly one after another.