 combustion zone
 convection zone
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Conserving heat
The chimney flue (1) is filled with hot gases much lighter than the air outside and which therefore only want to rise. We say that the chimney "draws". The chimney in fact literally sucks up the gases produced by the stove. However, the gases and the heat that they contain must not be allowed to escape too easily up the chimney. Two devices stop this from happening :
- At the entrance, the air required for
combustion (2) can only enter the stove through a vent (3) - i.e. an adjustable opening allowing you to control the quantity of air required to obtain the desired effect.
- At the exit, the hot gases cannot pass directly
into the chimney : they have to follow a
system of diverters (4), which constitute a
second bottleneck.
Thanks to these bottlenecks, the heat rises within the stove, which is necessary for complete combustion to take place (greater efficiency and lower emissions).
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Exactly what's required where it's required !
The air required for combustion is therefore reduced to the exact amount necessary and is distributed as follows :
- a small amount feeds the base of the flames (5),(5),
- another quantity enters the combustion chamber through small holes arranged between the bricks (6) at the back of the chamber and inflames the residual gases in the upper part of the stove ; this is post-combustion,
- a final quantity sweeps the glass (7) to prevent smoke from condensing there. This air is also used in post-combustion.
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2 air circuits
The air required for combustion can be drawn directly from outside using a duct (2).
Benefits :
- the outside air does not lower the house temperature before entering the stove,
- there is no risk of backdraught (nor CO intoxication) as the stove itself draws the air required from outside without rarefying the air inside,
- the operation of the stove is not affected by another system that consumes air such as a kitchen hood or air conditioning...
The room air heats up while circulating in a double wall around the stove. This circuit is completely separate from the combustion circuit. The room air is drawn from around the stove or from further away if the stove has a fan. It escapes from the front part of the stove. If the stove is a fitted model (Stûv 16-in), outlet ducts can be connected, for example,
to divert hot air into an adjacent room.
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