5
2.2.3
To a fireplace that has a precast concrete or clay
flue block system conforming to BS1289. The
appliance is suitable for installations conforming
to older versions of BS1289 as well as the current
edition. The flue blocks must have a minimum
width not less than 63mm and a cross-sectional
area not less than 13,000mm
2
.
Older editions of
BS1289 required a cross-sectional area of
13,000mm
2
. The current revision of the standard
requires 16,500mm
2
. This appliance is suitable in
both cases. The total depth of the opening
measured from the finished front of the fireplace
(Including plaster, surround etc) must be
not less
than 100mm.
The current version of BS1289 recommends that
there should be an air space or insulation between
the flue blocks and the plaster because heat
transfer may cause cracking on directly plastered
flues. However, generally this appliance is suitable
for installations under all circumstances unless
there is a history of cracking problems.
Remember that faults such as cracking may be
caused by poorly built and restrictive flues, e.g.
mortar extrusions, too many bends, flue heights
below three metres, restrictive terminations, etc.
2.2.4
To a builder’s opening within the dimensions
shown in figure 1a.
2.3
Suitable flues and minimum flue sizes are as
follows: -
a. 225mm x 225mm conventional brick flue.
b. 175mm diameter lined brick or stone flue.
c. 200mm diameter factory made insulated flue
manufactured to BS 4543.
d. 175mm diameter flue pipe (see B.S 6461 part 1
for suitable materials).
e. Single wall, twin wall or flexible flue liner of
minimum diameter 125mm. The materials to
be used are stainless steel or aluminium as
specified in B.S 715.
f. A properly constructed precast concrete or
clay flue system conforming to BS 1289 Part 1
or 2.
It should be noted that, sharp bends or
horizontal runs in metal flues at the top of the
system could be a cause of problems in these
types of installation.
2.4
The minimum effective height of the flue must be
3m.
2.5
The flue must not be used for any other appliance
or application.
2.6
Any chimney dampers or restrictors should be
removed. If removal is not possible they must be
fixed in the open position.
2.7
If the appliance is intended to be installed to a
chimney which was previously used for solid fuel,
the flue must be swept clean prior to installation.
All flues should be inspected for soundness and
freedom from blockages.
2.8
If the fireplace opening is of underfloor draught
type, it must be sealed to stop any draughts.
2.9
The appliance must be mounted behind a non-
combustible hearth (n.b conglomerate marble
hearths are considered as non-combustible). The
appliance can be fitted to a purpose made
proprietary class “O” 150°C surround. The
hearth material must be at least 12mm thick. The
periphery of the hearth (or fender) should be at
least 50mm above floor level to discourage the
placing of carpets or rugs over it.
The surface of the hearth must be sufficiently flat
to enable the bottom of the front surround, the
burner bracket and the bottom front cover casting
to be aligned horizontally. Any excessive
unevenness (uneven tiles, Cotswold stone, etc.)
should be rectified.
The appliance must not stand on combustible
materials or carpets.
The appliance must not be fitted directly against a
combustible wall.
If the appliance is to be fitted
against a wall with combustible cladding, the
cladding must be removed from the area covered
by the outer surround
(see figure 1c). We suggest
that the actual surround is used as a template to
mark the area for combustible cladding removal.
2.10
The minimum allowable distance to a corner wall
from the outside edge at either side of the front
surround is 178mm.
2.11
The front face of the fireplace should be
reasonably flat over the area covered by the
convection box top and side flange seals to ensure
good sealing. These faces should be made good if
necessary.
The fireplace floor should be reasonably flat to
ensure that a good seal with the convection box
can be made (see fig.15).
2.12
The minimum height from the top surface of the
hearth to the underside of any shelf made from
wood or other combustible materials is as follows:
-
•
For a shelf up to 150mm deep
Minimum height = 750mm.
•
For a shelf deeper than 150mm
Minimum height = 750mm + 12.5mm for every
25mm depth over 150mm.
2.13
Note that soft wall coverings (e.g. embossed vinyl,
etc.) are easily affected by heat. They may scorch
or become discoloured when close to a heating
appliance. Please bear this in mind when
installing.
2.14
The appliance must not be installed in any room,
which contains a bath, or shower or where steam
is regularly present
.
2.15
An extractor fan may only be used in the same
room as this appliance, or in any area from which
ventilation for the appliance is taken, if it does not
affect the safe performance of the appliance. Note
the spillage test requirements detailed further on
in this manual. If the fan is likely to affect the
appliance, the appliance must not be installed
unless the fan is permanently disconnected.
2.16
I
n the United Kingdom (GB)
no special
ventilation bricks or vents are required in the
room for this appliance
.
In the Republic of Ireland (IE), permanent
ventilation must comply with the regulations
currently in force.
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