Cassette Stove Installation Guide — BK605 Rev 04
5
Hearths and Recesses
The stove should be installed on a surface with
adequate load bearing capacity. If the existing
construction does not meet this prerequisite, suitable
measures (e.g. load distributing plate) should be taken
to achieve it. Please pay particular attention when
examining existing building work for suitability to
meet the following requirements.
Hearths and recesses for Cassette stoves should have
a sufficiently flat surface to allow a good seal to the
stove body to be created during its installation.
Stonework, uneven bricks etc. may need further work
to ensure that this can be achieved.
Cassette stoves should be installed into a recess on a
non-combustible surface not less then 125mm thick
(conforming to Building Regulations) of suitable load
bearing capacity. Allowances should be made for the
expansion and contraction of materials which are
fitted up to and near the appliance.
Dimensions of the constructional hearth for all stoves
(including any ’hole in the wall’ type installation)
should project at least 500mm forward of the front of
the appliance and 150mm at the sides. The surface of
the hearth should be free of combustible materials.
The superimposed hearth for all installations should
project at least 225mm forward from the front of the
appliance and 150mm either side of the edge of the
appliance.
In most buildings with solid concrete or stone floors,
the requirement will be met by the floor itself, but
mark the hearth to ensure floor coverings are kept
well away or use different levels to mark the hearth
perimeter.
Please be aware that hot air can cause staining above
in a similar fashion to walls above radiators.
To help prevent this and cracking we recommend that
any plaster above the fire should be fitted with
reinforcing expanding mesh for at least 220mm above,
and the full width of the fire. You should also use a
suitably heat resistant plaster.
When installing the stove into a recess it is important
that the front outer jacket edges sit 5mm proud of the
wall surface to enable the trims to clip onto the fire.
Combustible Materials
Please view the product sheet which accompanied
your stove for specific minimum distances to
combustible measurements.
Ideally, adjacent walls should be of suitable non-
combustible construction, preferably brickwork.
In large fireplaces take care that any supporting beam
is protected by a 13mm sheet of heat resistant fire
board spaced 12mm off the surface with strips of non-
combustible material. Make sure that there is a gap
between an un-insulated flue system and any
combustible material. This gap must be at least 3X the
outside diameter of the flue pipe, or 1.5X the flue
diameter to non-combustible surfaces.
Please consult the flue manufacturers specification for
insulated flues.
INSTALLATION REQUIREMENTS
