Ventilation; General Balanced Flue Notes - HASE Modena Gas Mode D'emploi

2.4

Ventilation

Balanced Flue appliances can be installed into a house without the need for additional
ventilation. They can also be installed into a room that has a forced mechanical ventilation
and/or fume extraction without any special extra requirements.
2.5

General Balanced Flue Notes

There are many possibilities for installing this Concentric
Balanced Flue system into a building, both Roof and Wall terminations are possible, and
the fl ue can either be built into an existing chimney or a completely new fl ue system may
be constructed.
The system is based upon a Concentric Flue system which utilises an inner fl ue of 10 cm
diameter which passes through an outer fl ue of 15 cm diameter. The fl ue gasses that are the
products of combustion of the fi re, pass through the inner fl ue and are safely vented to the
outside environment. The gap between the inner and outer fl ues is the channel by which the
stove is supplied with air for combustion.
These concentric fl ues terminate outside of the property in a terminal, this terminal will keep
the expelled gasses and the fresh air for combustion separate. It is important that the terminal
is not blocked, a suitable guard maybe required if the terminal is located at a "Low" level
(usually when the terminal is within 2 m of fl oor level).
If an existing Flue or Chimney is to be utilised, then the installation engineer must be con-
sulted. If the chimney has been previously used it must be professionally cleaned and certi-
fi ed as being sound and fi t for use.
The European CE approval on this appliance is restricted to the Flue systems as specifi ed
by the supplier, thus the appliance must only be installed with the original fl ue system, no
others may be used.
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Timber Frame Construction
Whilst it is possible to install room-sealed appliances in timber frame properties, great care
needs to be taken to ensure that the fl ue assembly does not interfere with the weather proo-
fi ng qualities of any outer wall which it may penetrate. Before attempting this work, further
details need to be referenced, (e.g. "Gas Installations in Timber Frame Buildings" from the
CORGI installer series in the UK).
Carport or Building Extension
Where a fl ue terminal is sited within a carport or building extension, it should have at least
two completely open and unobstructed sides. The distance between the lowest part of the
roof and the top of the terminal should be at least 60 cm.
Note: A covered passageway should not be treated as a carport.
Basements, Lightwells and Retaining walls
Flue terminals should not be sited within the confi nes of a basement area, light well or
external space formed by a retaining wall, unless steps are taken to ensure the products of
combustion can disperse safely at all times. It may be possible to install this Balanced Flue
system in such a location provided that it is not sited lower than 1m from the top level of that
area to allow combustion products to disperse safely.