RAIS Bionic Fire User Manual download pdf (Page 30)

English RAIS - manual for

Convection

RAIS stoves are convection stoves. This means that the stove’s back and side panels are

not over-heated. Convection means that there is a circulation of air, which ensures that

the heat is distributed more evenly throughout the entire room. The cold air is sucked in

at the base of the stove up through the convection channel, which runs along the stove’s

combustion chamber. The heated air pours out at the top of the stove, which ensures a

circulation of warm air throughout the room.

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 125 mm. Any bend in the chimney or connecting ﬂuepipe

should not exceed 45°. 90°bends should not be used.

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RAIS Bionic Fire User Manual Page 30