hergom Aranda Instructions Pour L'installation, L'utilisation Et L'entretien page 55

2.- Creosote formation and cleaning
When wood is burned slowly, tars and other organic vapours are produced that, when
combined with atmospheric humidity, form creosote.
The creosote vapours can be condensed if the chimney walls are cold. If the creosote
catches alight, extremely hot fires may be caused.
Any accumulation of creosote must be removed.
Due to the accumulation of creosote depending on many variables, it is very difficult to
predict the moment at which the chimney must be cleaned.
A visual inspection is the safest way of knowing whether the chimney of your stove is clean
of creosote.
We therefore recommend installations to which access is easy.
3.- Options
If you are going to build a chimney for your oven you have two alternatives:
a) Brickwork chimneys.
b) Metal chimneys
Studies reflect that there is no great difference between metal and brickwork in terms of
draught. It is you who, according to each case, will choose one or another.
Whenever possible, place your chimney inside the home to obtain a better draught and
accumulate less creosote, leading to a longer working life.
The advantages of brick chimneys are:
a) The mass of bricks and tiles reduces the cooling of smoke in the chimney.
b) The characteristics of the bricks in accumulating heat allows for the house to
remain warm for longer after the fire has been put out.
c) It may be built to individual tastes.
d) If it is well built, it may be more fire-resistant than metal chimneys.
Brickwork chimneys must be well lined to avoid smoke cooling.
They must be built using materials that withstand high temperatures and corrosion.
They may be round, square, etc. what matters is their size.
Brickwork chimneys for the Hergóm oven must respect the measurements indicated in the
chapter titled TECHNICAL DATA.
The advantages of metal chimneys are:
a) Easy installation.
b) Slight changes in chimney direction can be made, leading to greater
flexibility in the choice of location for the range cooker.
c) Due to there being curved elbow joint, sharp edges that make draught
difficult are removed.
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