Use a vent pipe and an anti-corrosion fume connection to the vent pipe. The temperature of the pellet stove fumes is very low. It could create condensation and
corrode the fume exhaust.
The flue pipe is one of the key features for guaranteeing correct functioning of the stove. Thanks to the quality of the materials, the strength, the durability, the
easy cleaning and maintenance, the best flue pipes are made of steel, either stainless steel or aluminised.
The stove is fitted with a Φ 80mm rear round fume outlet and a joint connection to be connected to the vent pipe.
In order to facilitate connection to the rigid steel flue, it is advisable to use telescopic fittings which, in addition to
facilitating the procedure, also compensate for the thermal expansion of both the firebox and the flue itself.
Seal the vent pipe joint connection with high temperature silicone sealant (1,000°C). In the event that the mouth of
the existing flue pipe is not perfectly perpendicular to the fume outlet of the fire box, their connection must be made
using a dedicated inclined fitting. The angle with respect to the vertical must never exceed 45° (see figure to the
side) and there must be no bottlenecks.
In case of passage through floors, an insulating sleeve of 10 cm thickness must be interposed.
The flue pipe must be insulated along its entire length. The insulation will make it possible to maintain a high fume
temperature to optimise the draught, avoid condensation and to reduce deposits of unburnt particles on the walls
of the flue. Use proper insulating materials (glass wool, ceramic fibre, Class A1 non-combustible materials).
The flue must be weatherproof and must not make more than two changes of direction.
Flexible and length-adjustable metal pipes may not be used.
EXISTING VENT PIPE EXTERNAL VENT PIPE
Types of vent pipe
Steel flue pipe with double chamber insulated with
material resistant to 400°C. Optimum efficiency.
Refractory flue pipe with insulated double chamber and
external coating in lightweight concrete. Optimal
efficiency.
Avoid flue pipes with internal rectangular section whose
ratio between the larger and smaller side is greater than 1.5.
Poor efficiency
Traditional clay flue pipe with cavities. Optimal efficiency.
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