18
English
RAIS/
attika
- User manual for VISIO
Chimney
The chimney is the driving force which makes the stove function. In order for the stove
to perform satisfactorily the chimney height must be sufficient to ensure the correct
draught of 14 to 18 Pa so as to clear the products of combustion and prevent problems
of smoke emanating into the room when firing.
NOTE: A chimney height of not less than 4.5 metres measured vertically from the outlet
of the stove to the top of the chimney should be satisfactory. Alternatively the calcula-
tion procedure given in BS 5854:1980 may be used as the basis for deciding whether a
particular chimney design will provide sufficient draught.
The outlet from the chimney should be above the roof of the building in accordance
with the provisions of Building Regulations Approved Document J.
If installation is into an existing chimney then it must be sound and have no cracks or
other faults which might allow fumes into the house. Older properties, especially, may
have chimney faults or the cross section may be too large i.e. more than 230 mm x 230
mm. Remedial action should be taken, if required, seeking expert advice, if necessary. If
it is found necessary to line the chimney then a flue liner suitable for solid fuel must be
used in accordance with Building Regulations Approved Document J.
Any existing chimney must be clear of obstruction and have been swept clean immedi-
ately before installation of the stove. If the stove is fitted in place of an open fire then
the chimney should be swept one month after installation to clear any soot falls which
may have occurred due to the difference in combustion between the stove and the
open fire.
If there is no existing chimney then either a prefabricated block chimney in accordance
with Building Regulations Approved Document J or a twin walled insulated stainless
steel flue to BS 1856-1 can be used. These chimneys must be fitted in accordance with
the manufacturer’s instructions and Building Regulations.
A single wall metal fluepipe is suitable for connecting the stove to the chimney but is
not suitable for using for the complete chimney. The chimney and connecting fluepipe
must have a minimum diameter of 180 mm. Any bend in the chimney or connecting
fluepipe should not exceed 45°. 90°bends should not be used.
Combustible material should not be located where the heat dissipating through the
walls of fireplaces or flues could ignite it. Therefore when installing the stove in the
presence of combustible materials due account must be taken of the guidance on the
separation of combustible material given in Building Regulations Approved Document J
and also in these stove instructions.
If it is found that there is excessive draught in the chimney then either an adjustable
flue damper or alternatively a draught stabiliser should be fitted. The adjustable flue
damper should not close off the flue entirely but should in its closed position leave a
minimum continuous opening free area of at least 20 % of the total cross sectional
area of the flue or fluepipe.
During the test, the stove was installed into a test enclosure arrangement made of 12,5
mm Fermacell H2O Powerboard non-combustible building slabs. The inner side of the
test enclosure was insulated with 25 mm mineral wool, type ProRox SL970 SC from
Rockwool.
The stove was also tested against a back wall of Super Isol (calcium silicate insulating
boards).
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