Leroy Merlin Equation EQHR-70S Instrucciones Para Instalación, Uso Y Mantenimiento página 30

1
Seal
Sellar
2
3
1. Brickwork chimney.
2. Pipe connecting Fireplace to the
chimney
3. Inflow of cool air to the lining
4.
Outflow of hot air to the room
B.- Chimneys.
The way the FIREPLACE works depends on:
g) The chimney.
h) How it is used.
i) The quality of the fuel used.
Over the years, you may change the type of fuel
you use but, once the chimney has been installed
in a given place, it is not so easy to alter or
reposition.
4
Fig. 2
.
Therefore, the following information will help you
decide whether you can use your present chimney
or not or help you decide to build a new one.
This information will help you make the correct
decision.
1. - How chimneys work
A basic knowledge of the dynamics of chimneys will
help you make the most of your Built-in Fireplace
EQH. Chimneys:
a) Safely evacuate smoke and gasses from
the house.
b) Provide sufficient draw in the hearth to
keep the fire alive.
What is the "chimney draw"?
The tendency air has to rise generates the chimney
effect.
When a FIREPLACE is lit, hot air rises through the
chimney. The chimney flue heats up and keeps it
drawing. Until the fireplace and the chimney are
hot enough, the chimney effect will not work
properly.
The chimney effect depends on the location, size
and height of the chimney.
The following must be taken into consideration:
- Chimneys located inside a house keep warm and,
therefore, chimney draw is greater.
- The chimney size recommended by the
manufacturer will provide a good chimney effect.
- The height of a chimney affects how it draws:
greater height  better chimney effect
The chimney must project at least one metre over
the highest part of the roof.
Other factors also affect chimney draw:
- Houses that have very good internal insulation,
free from draughts, provide inadequate draw as no
air enters the building. This can be corrected by
allowing external air to reach the FIREPLACE.
- High trees and/or buildings near the house also
have a negative effect on chimney draw.
- Wind speed. Usually, sustained strong winds
increase chimney draw but stormy winds have a
negative effect.
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