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 damper for approx. 1 minute before the door is opened. This increases the draft
through the stove.
3.1.2 Secondary damper
The secondary damper behind the door allows you to adjust the wood burning stove to the chimney draft and
the required heat output. Turning the damper to the left decreases the air supply and turning to the right
increases the air supply. In normal circumstances, the wood burning stove should be working with this
damper open between 60 % and 100 %. 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. The air-wash system that minimises
soot on the front glass is also adjusted by this damper.
If you want to fire in the stove with the lowest possible effect – around 3 kW – you must close the secondary
damper 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.
Aduro Key: The stove comes with an Aduro-key which provides easier control of the
secondary damper. The key is fitted onto the control handle in order to easily adjust the
airflow from side to side. See illustration.
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 www.adurofire.com.
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 primary damper can be kept "forcibly open". This is done by
pulling the primary damper out 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. It is important that there are
still clear flames after the damper is closed.
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
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