MCZ Boxtherm 60 Pellet - Manual (Page 15)

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2-INSTALLATION INSTRUCTIONS
OPERATING PROBLEMS RELATED TO DRAUGHT DEFECTS IN THE CHIMNEY
Among all the weather and geographical conditions that affect chimney operation (rain, fog, snow, altitude a.s.l., exposure to sunlight,
orientation to the cardinal points, etc.), the wind is certainly the most determinant. In fact, besides the thermal depression caused by
the difference in temperature between inside and outside the chimney, there is another type of depression (or overpressure): dynamic
pressure caused by the wind. An updraft always increases depression and therefore the draught. A horizontal wind increases depression
provided the chimneypot has been installed properly. A downdraft always decreases depression, at times inverting it.
Besides the direction and force of the wind, the position of the chimney and the chimneypot with respect to the roof of the building and
the surrounding landscape is also important.
The wind also affects chimney operation indirectly by creating overpressure and depression zones within the building as well as outside.
An internal overpressure can be created in rooms that are directly exposed to the wind (2), which can enhance the draught in stoves and
fireplaces, however, it can be counteracted by the external overpressure if the chimneypot is situated on the side exposed to the wind
(1). On the other hand, a dynamic depression can be created in rooms that are opposite the wind direction (3), which competes with the
natural thermal depression generated by the chimney, however, this can be compensated for (sometimes) by placing the smoke duct
opposite the wind direction (4).
IMPORTANT!
The operation of the pellet product is significantly affected by the chimney layout and position.
Hazardous conditions can only be resolved by qualified personnel setting the product appropriately.
A=LESS FAVOURABLE POINTS
B=MOST FAVOURABLE POSITION
Technical Dept. - All rights reserved - Reproduction is prohibited
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