Manual Rais Visio 1 (page 148 of 534) (English, German, Dutch, Danish, French, Swedish, Norwegian, Finnish)

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English RAIS/

attika

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ser 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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Rais Visio 1 Manual

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