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Cassette Stove Installation Guide — BK605 Rev 04
Masonry Chimney: Built with clay or concrete
liners, or a chimney block system meeting
Building Regulations. These types of chimneys
should be installed in accordance with the
Building Regulations and BS EN 15287-2:2008
Factory Made Insulated Chimney: Complying
with BS 4543:Part 2 (often called Class 1
prefabricated metal chimney). These types of
chimneys should be installed in accordance with
Building Regulations and BS EN 15287-2:2008.
Due to the gradual introduction of European Chimney
Standards chimneys will be specified according to
their performance designation as defined in BS EN
1443 that covers the General Requirements for
chimneys. The minimum performance designation
required for use with solid fuel burning stoves is T450
N2 S D3.
The flue and chimney installation must be carefully
checked by a competent person before fitting the
stove to ensure it is suitable and will work safely.
If the chimney is old (i.e.: built of brick or stone
without a liner) or being opened up for reuse
additional checks and smoke testing as described in
Appendix E of the Approved Document J 2010 Edition
should also be carried out to ensure the flue and
chimney are in good operating condition.
Check the existing flue is in good condition with
suitable access for collection and removal of debris.
It is also important that suitable flue pipe
(recommended at least 600mm in length) complying
with the Building Regulations is used to connect the
stove to the flue in the chimney. Suitable access
should be provided into the flue for regular inspection
and sweeping of the flue ways. The installer should
comply with Building Regulations requirements in
respect of providing a Notice Plate giving details on
the chimney, flue lining, hearth and fireplace
installation.
Chimneys should be as straight as possible.
Horizontal runs should be avoided except where the
rear outlet of the appliance is used, in which case the
horizontal section should not exceed 150mm in
length. If necessary a combination of 45° and 90°
bends can be used as long as the sum of their angles is
not greater than 180° in total. i.e. four 45° bends, or
two 45° and a 90° bend.
If the stove appears to be working hard but produces
very little output to the room, it is likely that excess
draw is present in the flue and that heat is being
sucked out of the appliance via the chimney.
To remedy this problem, we recommend fitting of a
draught stabiliser in preference to a flue damper, in
the interest of safety and efficiency, together with
insulating around the exterior of the appliance, this
will ensure heat loss into the fabric of the building is
kept to a minimum.
FLUES AND CHIMNEYS
