39
3.1.1 Primary air
When you add new logs, the primary air should be opened until the fire is burning properly. In order to utilise
the fuel to the fullest extent, the embers should have burnt for so long that it is necessary to open the primary
air for approx. 2 minutes to get the logs burning. However, it is important to fire at a certain time so that the
flames do not go out during the closing time for the Aduro-tronic.
In order to reduce the risk of ash falling from the stove when the door is opened to add more fuel, it is a good
idea to open the primary air for approx. 1 minute before the door is opened. This increases the draft through
the stove.
3.1.2 Secondary air
In normal circumstances, the wood burning stove should be working with the secondary air supply open
between 60 % and 100 % (the damper is placed between position 2 and 3. See section 3.1). You should
never close the air supply so far that the flames go out. There should always be visible flames in order to
achieve a clean and efficient combustion. A too low supply of air can lead to bad combustion, high
emissions, and a low efficiency.
If you want to fire in the stove with the lowest possible effect
– around 3 kW – you must close the secondary
air almost completely approx. 45 minutes after stoking. At this point there are only few flames, and the stove
can burn clean by using the tertiary air from the back of the combustion chamber.
3.2 Aduro-tronic
Aduro wood burning stoves are equipped with the patented Aduro-tronic automatic as a standard. Aduro-
tronic is a manually operated mechanical start-up device, which works without the use of electricity. It
automatically regulates the combustion air and thus secures an efficient combustion. For further information,
go to
3.2.1 How to operate Aduro-tronic
When lighting
When lighting a fire in the stove, the maximum amount of primary air will be needed to
light the fire. For that reason, the damper
can be kept “forcibly open”. This is done by
pulling the damper forward as far as possible and then fixing it with the Aduro Key (see
illustration). When the stove is warm and a layer of embers has been created on the
bottom of the combustion chamber, the Aduro-tronic can be set to the automatic
position, i.e. the Aduro Key can be removed. Alternatively, you can leave the door ajar
the first few minutes during the ignition phase (without the key).
When stoking
You activate the automatic by pulling out the damper every time new firewood is added. The Aduro-tronic
automatic will then close the damper gradually after the pre-programmed time.
Regulation of the Aduro-tronic automatic
The automatic is pre-set to close the primary air intake within 6 minutes. This setting has been used during
testing at the Danish Technological Institute using a standard chimney and ‘standard’ sized logs (approx. 30
cm long and 10x10 cm thick) with maximum moisture content of 18%. In practice, such circumstances can
differ, which is why the Aduro-tronic automatic can be adjusted to your circumstances. If you want a slower
intake of primary air (e.g., for a lower chimney draft, larger sized wood, or for longer intervals between
