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- External temperature. The colder it is outside, the greater the chimney effect.
- Atmospheric pressure. The chimney effect is usually poor on rainy, damp or
stormy days.
- Intensity of the fire. The hotter the fire, the stronger the chimney effect.
- Cracks in the chimney, badly sealed or dirty covers, air entering through
pipe joints, other devices connected to the chimney.... may affect chimney
draw negatively.
2.- Creosote formation and cleaning.
When wood burns slowly, it produces tar and other organic fumes that, when
combined with a damp atmosphere, form creosote.
Creosote fumes may condense if the chimney walls are cold. If it catches fire,
extremely tall fires may be caused.
Any accumulation of creosote must be eliminated.
As the accumulation of creosote depends on a number of variables, it is very difficult
to know when the chimney should be cleaned.
The safest way of ensuring that the chimney of your cooker is creosote free is by
performing a visual inspection.
Consequently, we recommend building installations that are easy to access
3.- Options.
If you are going to build a chimney for a Hergóm Nansa cooker, you have two
alternatives:
a) Brickwork chimneys.
b) Metal chimneys.
Studies have reached the conclusion that there is no great difference in performance
between metal and brick-cement chimneys. You will have to choose one or the other.
Whenever possible, build your chimney inside the house; this will provide better draw,
lower creosote accumulation and a longer life.
The advantages of brick chimneys include:
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