hergom E-10 PLUS Instructions D'installation, De Service Et D'entretien page 24

Use of a chimney that is too small or oversized may cause the stove to fail to function
properly, contributing to the build-up of creosote.
MASONRY CHIMNEYS
The advantages of these chimneys are:
 The mass of bricks and/or floor tiles reduce the
cooling of the vapours in the chimney.
 The heat accumulating characteristic of bricks
allows the house to be kept warm for a longer
period once the fire has gone out.
 It can be built to suit individual taste.
 If it is well built, it may be more resistant to fire
than metal chimneys.
Masonry chimneys should be well lined around the
exterior of the building to avoid the cooling of vapours.
They should be built with materials that withstand high
temperatures and corrosion.
Make sure that the chimney is clean and functions
correctly, so as to prevent loss of flue and the
accumulation of creosote.
Make sure that the size of the chimney is appropriate
and is not too high.
If it is excessively high, a flue shut-off valve
should be installed.
If your masonry chimney is of a greater section than
that recommended by the manufacturer of the
appliance, it is advisable to install inside another
metal chimney with the appropriate dimensions in
order to avoid operating problems and the build-up of
creosote.
In this case, it is advisable to seal one of the ends of
the masonry chimney to avoid the creation of drafts
which may cool the chimney. (See Fig.-3)
It is advisable that this sealing is performed in the upper part, so as to take advantage of the
heat that is produced throughout the whole chimney. Similarly, it is advisable to perform a
circulation inside this chamber between the pipes and the masonry chimney to allow a
certain relief and avoid excessive heat which produces deterioration in the walls (cracks,
etc.). It is suffice to position a lower and upper grate (15x10 cm.) in this chamber. The air will
circulate by natural convection, taking the hot air from the lower part to the upper part of the
building.
SEALING ONE
OF THE ENDS
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Fig.- 1