NOV12GB Issue 2
8
Chimney Requirements
This appliance must not be fitted into a chimney serving another heating appliance. It is
most important that there is no obstruction in the flue or chimney. Please ensure that any
existing chimney is clear of obstruction and swept clean immediately before installation of
the new stove. If the chimney has been used for an open fire it is recommended that it be
swept for a second time having been used for a month following installation.
A flue draught minimum of 10 Pascals to a maximum 14 Pascals is required for
satisfactory appliance performance. A properly built masonry or factory constructed
chimney (with a minimum vertical height of 5 metres) should ensure a consistent draught
(draw). 45° bends can be used in the flue run (maximum of four bends) you will need to
add an extra 1 metre of vertical flue height for each bend.
The flue draught should be checked under fire at high output and if it exceeds the
recommended maximum, a draught stabiliser must be fitted so that the rate of burning can
be controlled, and to prevent over firing (See section “Warning Notes”). If you have any
doubts about the suitability of your chimney, consult your local dealer/stockist or engineer.
If your flue draft is below the minimum recommendation then it may be neccesary to
increase the vertical chimney height, add additional flue insulation or possibly add a
special cowl to the top of the chimney (e.g. anti down draft cowl to eliminate wind induced
down draft).
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.
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 4543 can be used. These chimneys must be fitted in accordance with the
manufacturer’s instructions and Building Regulations.
If a flexible liner is required the liner diameter must not be less than 6”.
Any bend in the chimney or connecting fluepipe should not exceed 45°. 90° bends are not
permitted. . For top flue installations it is possible to sweep through the appliance by
removing the internal baffle however it is recommended that you provide adequate access
(e.g. easily accessible soot door).
