Ventilation/Fresh Air Supply; The Chimney; Inadequate Draught In The Chimney; Draft And Pellet Combustion - ADURO H1 Manual De Instrucciones

3.9 Ventilation/fresh air supply

In order for the Aduro H1 to function at optimum efficiency, air is
needed for the combustion process. There must be sufficient fresh
air coming into the room containing the Aduro H1. In very well-
insulated houses, or houses with powerful cooker hoods and/or air
conditioning systems, a vacuum can be created around the Aduro
H1, 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 Aduro H1. The amount of air
needed for combustion is 25 m3/h. See also point 2.3.

4.0 The chimney

Data for chimney calculation:
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.
There are no requirements with respect to specific chimney heights, but a chimney must be tall enough to
provide a good draught – above 12 Pa. If the recommended chimney draught is not achieved, there may be
problems with smoke out of the door by firing.

4.1 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
provide satisfactory combustion and prevent smoke leakage. The easiest solution to chimney problems is to
install an Aduro DraftOptimizer – for futher information, see http://www.adurofire.com/accessories/aduro-
draftoptimizer.
If the chimney sweep judges the draught to be satisfactory, but you still have problems lighting a fire, try
extending the fire lighting phase/using more thin pieces of kindling, so that the chimney gets thoroughly
warm. The chimney will not draw at optimum effect until it is warm. The fire lighting phase can be prolonged
by using a lot of kindling and 1-2 firelighters. When a layer of embers has been formed, add 2–3 dry logs.

4.2 Draft and pellet combustion

The pellet combustion is affected by the draft in the chimney. If necessary, it is important to reduce or
improve the draft with a damper in the chimney or with a draft optimizer.
Aduro DraftOptimizer can connect to Aduro H1 and adjust automatically to ensure optimal draft. Read more
on www.adurofire.dk
Below 3 examples of pellet combustion, depending on the draft level.
Flue temperature at [20°C]
Chimney draught at testing power [mbar]/[Pa]
Flue gas mass flow [g/s]
Træ
273
0,13/13
5,7
52