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SMOKE VENT AND COMBUSTION AIR SUCTION
8.2 SMOKE OUTLET
The smoke outlet shown in the following figures is the best solution to ensure the discharge of smoke even when the fan
is not operational, such as for example if there is an electrical power failure. A minimum drop of 1.5 metres is required
between the T terminal on the outside of the building and the outlet at the back of the appliance, to ensure that residual
combustion smoke is discharged in the case described above (Otherwise the residues would stagnate inside the firebox and
be discharged out to the free atmosphere).
The figures below illustrate the best solution for discharging the smoke out through the roof or into the flue outlet. If you
opt to discharge the smoke out through the roof it is important to operate as shown in the figure below on the left. The
smoke outlet tubes, given the low temperature of the gases, must be insulated. We recommend installing a “T” condensation
collector. Insert a union tee with inspection cap, connecting brackets suitable for the height of the flue outlet, flashing that
crosses the roof and chimney cap to protect against bad weather conditions. If you decide to use a classic masonry outlet
see the diagram below on the right. A union tee with inspection cap and suitable supporting brackets are required. If the
flue outlet is too big we recommend inserting a stainless steel or porcelain-coated steel tube with a diameter not exceeding
150mm. Seal area where the inlet and outlet part of the smoke exhaust meets the wall.
It is strictly forbidden to apply mesh to the end of the outlet tube , as it
could cause the appliance to malfunction. If the smoke tube is installed
in a fixed position it is advisable to provide inspection openings for
clean-out purposes especially in the horizontal sections. See the
diagram. These openings are essential to allow for the removal
of ash and unburned products which tend to accumulate along the
discharge path. The appliance functions with the firebox in a vacuum,
while the discharge of smoke to the flue outlet has a slight pressure,
consequently it is imperative to ensure that the discharge system is
hermetically sealed. The smoke discharge tube must be made from
suitable materials such as for example:
porcelain-coated steel tubes, and the various fittings sealed with red
silicone (resistant to 350°C). The outer casing of the tube must be
made with insulating material (mineral wool, ceramic fiber) or use
pre-insulated tubing.
It must be possible to inspect and remove all the smoke tube sections for clean-out purposes.
CAUTION: IF THE SMOKE FLUE IS NOT SUFFICIENTLY INSULATED AND/OR IT IS TOO LONG
IT COULD GENERATE CONDENSATION: IT IS ADVISABLE TO INSTALL A CONDENSATION
OUTLET NEAR THE APPLIANCE OUTLET.
Rain protection
Cover slab
Hermetic sheet
steel
Inspection
Inspection
External
Internal
