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Page 52
Installation and operation manual - Bistro woodburning cookstove
ENGLISH
Venting systems that rise straight up from the stove flue collar provide the best performance. Chimneys
that rise inside the warm space of the house tend to provide a small amount of draft even when there
is no fire burning. This means that when a fire is lit, the smoke goes up the chimney and strong draft
build quickly as the chimney flue warms up. Although they are common in North America, chimneys
that exit a house wall and run up outside can cause problems.
Figure 35: Good System Design Figure 36: Acceptable System Design
When it is cold outside, the warm air in the house is buoyant so it tends to rise. This creates
a slight pressure difference in the house. Called ‘stack effect’, it produces a slightly negative
pressure in the lower part of the house (compared to the outside) and a slightly positive pressure
zone in the high part of the house. If there is no fire burning in a heater connected to a chimney
that is shorter than the warm space inside the house, the slight negative pressure in the lower
part of the house will compete against the desired upward flow in the chimney. This occurs for
the two following reasons:
First, the chimney runs up the outside of
the house, so the air in it is colder and
denser than the warm air in the house.
And second, the chimney is shorter than
the heated space of the house, meaning
the negative pressure in the lower part
of the house will draw cold air down the
chimney, through the stove and into the
room. Even the finest stove will not work
well when connected to this chimney.
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