Hergom Besaya Instrucciones Para La Instalación, Uso Y Mantenimiento página 60

- 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.
b) 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 fireplace is creosote free is by
performing a visual inspection.
Consequently, we recommend building installations that are easy to access.
c) Options
If you are going to build a chimney for a Hergom Besaya 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:
- Fumes cool off more slowly inside the chimney due to the mass of bricks and tiles.
- As bricks accumulate heat, the house keeps warm longer after the fire is put out.
- It can be built to the specific requirements of each person.
- If well built, it will be more resistant to fire than metal chimneys.
Brick chimneys must be well lined to prevent the fumes from losing temperature.
They must be built with materials that support high temperatures and corrosion.
They may be round, square...., what matters is their size.
Brick-work chimneys for the Hergom Besaya model must comply with the
measurements indicated in the chapter on TECHNICAL DATA.
The advantages of metal chimneys include:
- Easy installation.
- It is possible to change the direction of the chimney slightly, which provides greater
flexibility when deciding where the cooker should be installed.