4
2.5
In 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.
2.6
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.
2.7
A slotted firefront with minimum free area as shown in
figure 1 must always be used.
2.8
The minimum allowable distance to a corner wall or
other combustible projection from the outside edge of the
front surround at either side is 100mm.
2.9
The minimum clearance from the top surface of the
appliance surround to the underside of any shelf made of
combustible materials is as follows:-
For a shelf up to 150mm deep
Minimum clearance = 200mm.
For a shelf deeper than 150mm
Minimum clearance = 200mm + 12.5mm for every
25mm depth over 150mm.
2.10
The appliance must not be installed in any room, which
contains a bath, or shower or where steam is regularly present
.
2.11
In the United Kingdom, as supplied, this appliance can
be installed in the following situations: -
2.11.1
A masonry chimney with a minimum diameter of
175mm free from obstruction. Note the flat surface area
requirement (Figure 2). A
masonry chimney having a
correctly installed flue
liner to BS715 and with a
minimum flue diameter of
125mm is also acceptable.
Chair brick removal may
not be required providing
at least 50mm clearance is
available from the flue
outlet to any fireplace
component.
2.11.2
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 158mm.
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.
2.11.3
A twin wall metal flue system conforming to
BS715, the flue diameter being a minimum of 125mm (See
figure 4) with a minimum internal diameter of 190mm.
Incombustible mineral wool insulation of not less than 50mm
thickness must be applied to the top surface of the system
firebox and must stand on a non-combustible base of 25mm
thickness.
Figure 1
Figure 2 Masonry Fireplace
Figure 3 Precast Fireplace
Figure 4
