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The pipe should consist of an "Avis Technique" approved rigid or flexible multi-fuel tube designed to be used
directly with a closed fireplace.
lt should be noted that the following are forbidden : aluminium, aluminium steel and galvanized steel.
The flue must be visible over its whole length through a grille or inspection flap and be able to be swept by
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mechanical means. Any expansion should not adversely affect the smoke-tightness of the joins at either end
or its mechanical performance or that of the smoke flue. lts design, and more especially the connection
between it and the smoke flue, should be such as to prevent the accumulation of soot, particularly when it is
being swept.
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Connections to the appliance and the flue should strictly comply with DTU 24.2.2 and with the specifications
of the pipe's manufacturer ; they should include all the recommended parts (end pieces and all other fittings).
5.4 DRAUGHT REQUIREMENTS
Draught is measured on the connecting pipe at a point approximately 50 cm above the outlet on the appliance.
The following draught is required for proper working with the doors closed :
. 6 Pa at reduced speed (0,6 mm WG)
. 12 Pa at normal speed (1,2 mm WG)
The installation of a damper is highly recommended (Fig. 5).
The damper ensures that the appliance works properly, even when the draught is considerable (high flue, piping). It
should be readily visible and accessible.
The damper does not affect the insert performance when doors are open.
5.5 VENTILATION OF THE AREA IN WHICH THE APPLIANCE IS TO BE INSTALLED
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The appliance needs air in addition to the air required by the statutory air change rate. This is obligatory
when the dwelling includes mechanical ventilation.
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The air intake should give directly to the outside or should be located in an area ventilated to the outside ; it
should also be protected by a grille (see recommendations on Fig. 6).
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The air outlet should be located directly either in the fireplace and come out near the thermostat adjusted air
inlet, or as near as possible to the appliance. The user should be able to close it off when it comes out
directly into the room.
The air intake section should be at least equal to one-quarter of the section of the smoke flue with a
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minimum of :
. 50 cm² for use with doors closed
2
. 200 cm
if people wish to use the insert with open doors
It may be necessary to stop the extractor of the mechanical ventilation so as to avoid smoke coming back
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into the room when the doors are open.
5.6 NATURE OF WALLS AND OTHER BOUNDARY STRUCTURES IN THE VICINITY OF THE APPLIANCE,
BUILDING-IN DIMENSIONS AND TYPE OF PROTECTIONS/INSULATIONS TO USE
5.6.1 Installation advice
Remove all materials, that are either combustible or affected by temperature, from walls and inside elements
(doors, walls and ceilings) near the chimney and the fireplace.
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The appliance should be encased in MO-rated incombustible materials.
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The floor should be of incombustible material from under the appliance to at least 400 mm in front of the
appliance.
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If the mantelpiece is made of a combustible material (wooden beam, for example), it must be protected by
some sort of incombustible material, by a deflector or by the fascia (see DTU 24-2-2 and Fig. 10).
.
If the supporting wall is a light partition wall with combustible built-in insolation, it must be lined with
incombustible material : 10 cm cellular concrete with a 2 cm cavity across the whole width of the fireplace
extending 5 to 10 cm each side.
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