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CONNECTION TO THE SMOKE EVACUATION SYSTEM
Smoke channel or connections
To mount the smoke channels, non infl ammable elements will have to be used, ideal for resisting fuel
products and their eventual condensing.
The use of fl exible metal and asbestos cement pipes to connect the appliances to the fl ue is forbidden,
even for pre-existing smoke channels.
There must be continuity between the smoke channel and the fl ue so that the fl ue does not lean on the
generator.
The smoke channels must not cross rooms where the installation of the combustion appliances is not
allowed.
The mounting of the smoke channels must be carried out in order to guarantee smoke seal for the
appliance functioning conditions, limit the forming of condensate and avoid it being transported towards
the appliance.
The mounting of horizontal routes must be avoided.
For appliances where ceiling or wall non coaxial discharges respect to the appliance smoke outlet have to
be reached, the direction changes will have to realised using open elbows not higher than 45° (see fi gures
below).
INSULATION
For the heat generator appliances equipped with electro-ventilation for expelling smoke, i.e. all Extrafl ame
products, the instructions below will have to be followed:
The horizontal routes will have to have a minimum upward slope of 3%
The length of the horizontal route must be minimal and, however, not higher than 3 meters
The number of direction changes including the one for eff ect of using the "T" element
must not be more than 4 (if 4 bends are used, use double wall piping with an internal diameter of 130
mm).
In any case, the smoke channels must seal the fuel and condensing products and be insulated if they pass
externally to the installation room.
The use of counterslope elements is forbidden.
The smoke channel must allow the recovery of soot or be brushed.
The smoke channel must be at constant section. Any section changes are only allowed at the fl ue
coupling.
It is forbidden to have other air supply channels and pipes for plant engineering, especially if over-sized,
transit inside the smoke channels. The mounting of manual draught adjustment devices on forced draught
appliances is forbidden.
12
fi gure 3.5
Chapter 3
FLUE
INSPECTION
fi gure 3.6
MOUNTING PHASES
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