Creosote Formation And Cleaning; Options - hergom SAJA 7 Instruction Book

- Houses with extremely good indoor insulation, without air currents: with no air
entering the stove, the draught is affected. This is correct by sending air from outside to
the range cooker.
- Trees and/or tall buildings close to the home hinder the draught.
- The wind speed. Generally, persistently strong winds increase the draught,
although stormy winds may decrease the draught.
- Outside temperature. The colder it is outdoors, the better the draught.
- Barometric pressure. On rainy, humid or stormy days, the draught is generally
weak.
- Liveliness of the fire. The hotter the fire, the stronger the draught.
- Cracks in the chimney, badly sealed or dirty doors, air inlets through the tube
joints, other appliances connected to the chimney, etc. may produce unsuitable draughts.

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 HERGÓM SAJA mod. cooker, 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.
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