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4.5 How should I use my wood burning stove?
The wood burning stove is intended for intermittent combustion. This means that each stoking should burn
down to embers before new logs are added.
In order to obtain the best possible combustion, you should regulate the effect/heat output with the fuel.
Burning small logs provides more powerful combustion than burning large logs as the surface area is greater
and more gas is released. The amount of wood in the combustion chamber is another factor that affects
combustion. In normal circumstances, you should not place more than two logs in the stove. If you want an
enhanced effect, you can add more logs. The nominal heat output is reached by burning approx. 1,3 kg per
hour.
4.6 Secondary damper
The secondary damper should always be open while the wood burning stove is in use. This damper allows
you to adjust the wood burning stove to the chimney draft and the heat output you require. In normal
circumstances, the wood burning stove should be working with this damper open between 60 % and 100 %.
You should never close the air intake so far that the flames are extinguished. There should always be visible
flames in order to achieve clean and efficient combustion.
4.7 Primary damper
When you add a new log, the primary air intake/damper should be opened until the fire is burning properly. In
order to utilize the fuel to the fullest extent, the embers should have burnt for so long that it is necessary to
open the primary air intake for approx. 2 minutes to get the new log to burn.
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 intake/damper for approx. 1 minute before the door is opened. This increases
the draught through the stove and reduces the risk that ash will drop on the floor.
Please note: if you overload the wood burning stove and burn more than approx. 2.5 kg wood/hour, there is
a risk that the lacquered surface of the stove will become discoloured and eventually fall off. The stove can
be resurfaced, but this is not covered by the manufacturer’s guarantee. In the same way, any other damage
to the stove caused by overloading will not be covered by the guarantee.
4.8 Ventilation/fresh air supply
In order for the wood burning stove to function at optimum efficiency, air is needed for the combustion
process. There must be sufficient fresh air coming into the room containing the wood burning stove. In very
well-insulated houses, or houses with powerful cooker hoods and/or air conditioning systems, a vacuum can
be created around the stove, leading to smoke leakage and poor combustion. In these circumstances, it
might be necessary to open a window to provide air for combustion and to equalize the vacuum.
Alternatively, you could fit an air vent in the room containing the wood burning stove.
5.0 The chimney
Data for chimney calculation:
Wood
Flue temperature at [20
°
C]
367
Chimney draught at testing power
[mbar]/[Pa]
0.12/12
Flue gas mass flow [g/s]
4,0
The optimum combustion is achieved at a constant chimney draught of 0.10 to 0.14 mbar measured in the
flue pipe above the stove. There are many factors that affect the chimney draught, including the outside
temperature, wind strength and surrounding buildings. If it is impossible to establish a sufficiently natural
chimney draught, the chimney can be fitted with a smoke extractor. If the chimney draught is too strong, a
damper can be fitted to regulate the chimney draught. Contact your local chimney sweep for more advice.
5.1 Inadequate draught in the chimney
If the chimney is too short, leaks or is inadequately insulated, there may be problems with the chimney
draught (let the chimney sweep assess this). The draught should be approx. 0.10–0.14 mbar in order to