Leroy Merlin Equation EQHR-70S Instrucciones Para Instalación, Uso Y Mantenimiento página 31

- 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 doors,
air entering through pipe joints, other devices
connected to the chimney.... may have a negative
effect on chimney draw.
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 fireplace 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 your
Built-in Fireplace EQH, 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:
a) Fumes cool off more slowly inside the
chimney due to the mass of bricks and tiles.
b) As bricks accumulate heat, the house
keeps warm longer after the fire is put out.
c) It can be built to the specific
requirements of each person.
d) 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.
Brickwork chimneys
Fireplace EQH
measurements indicated in the chapter on
TECHNICAL DATA.
The advantages of metal chimneys include:
a) Easy installation.
b) It is possible to change the direction of
the chimney slightly, which provides greater
flexibility when deciding where the fireplace should
be installed.
c) Curved joints can be used, which
eliminates acute angles that have a negative effect
on draw.
4. - Some rules
We shall now explain a number of rules that should
be followed when building a chimney:
a) Use resistant, fireproof materials. Do not
use cement asbestos pipes.
b) Choose the most vertical route possible.
Do not connect several devices to the same
chimney.
Incorrect
31
for the
must comply with
Angle too
flat
Accumulation
of ash
Correct
Fig.3
Built-in
the
Correct angle