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2.3
The appliance must not stand on a carpet or any
other combustible material.
If a panel has to be fitted to the fireplace opening to meet
the required opening sizes shown below, it must be
made of non-combustible material.
The appliance can be installed in the following
situations.
2.3.1
Conventional fireplace and hearth
The appliance can be installed to a fireplace complete
with surround and hearth.
The fireplace opening must be within the following
dimensions:
Width: Max.
457mm
Min:
305mm
Height Max:
620mm*
Min.
510mm
* Though the total height of the closure plate will
accommodate a maximum opening height of 650mm,
heights above 620mm will leave the closure plate and
sealing tape visible above the appliance.
The appliance must be mounted on a non-combustible
hearth (N.B. conglomerate marble hearths are
considered as non-combustible). The hearth must be at
least 880mm wide x 300mm deep. 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 appliance can be fitted to a purpose made
proprietary class "O" - 100"C or O"-150°C surround.
2.3.2.
Wall mounted
The appliance can be wall mounted.
The appliance is not suitable for installation on
combustible walls.
The opening must be within the following dimensions:
Width: Max.
356mm
Min.
305mm
Height: Max.
620mm*
Min.
376mm
* Though the total height of the closure plate will
accommodate a maximum opening height of 650mm,
heights above 620mm will leave the closure plate and
sealing tape visible above the appliance.
The bottom of the fire must be at least 102mm above
the finished floor covering. This requires that the top of
the opening must be at least 612mm above the finished
floor covering.
2.3.3.
Precast flue
The appliance can be installed 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
revision of the standard requires 16,500mm
appliance is suitable in both cases.
The chimney should be one or two storeys high but not
less than 3m vertical height and be correctly terminated.
2
. The current
2
. This
No mortar fangs between the blocks should be extruded
into the flueway. If raking blocks are used, they must be
fitted in accordance with the manufacturer's
instructions. Mortar must not be allowed to drop down
and accumulate in the raked positions.
The fireplace opening must be within the following
dimensions:
Width: Max.
457mm
Min:
305mm
Height Max:
620mm*
Min.
610mm*
* Though the total height of the closure plate will
accommodate a maximum opening height of 650mm,
heights above 620mm will leave the closure plate and
sealing tape visible above the appliance.
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.
2.3.4.
Metal flue box
The appliance can be installed to a metal flue box
complying with the constructional requirements of the
current edition of BS715.
The opening must be within the following dimensions:
Width: Max.
457mm
Min:
380mm
Height Max:
620mm*
Min.
510mm
* Though the total height of the closure plate will
accommodate a maximum opening height of 650mm,
heights above 620mm will leave the closure plate and
sealing tape visible above the appliance.
2.4.
Flues
Suitable flues are:
a) 225mm x 225mm conventional brick flue. If a liner is
used, it must be a minimum of 127mm (5in.)
diameter. The liner must be sealed to the
surrounding area above the fireplace opening and to
the top of the chimney and have an approved
terminal.
b) A properly constructed precast flue conforming to
BS1289 (See section 2.2.3.)
c) A flue pipe with a minimum diameter of 127mm
(5in.). See BS6461 Part 1 for suitable materials.
Metal flue pipes must comply with BS715. See
section 2.2.4. for metal flue box requirements.
2.4.1.
The flue must have a minimum equivalent
height of 3m.
2.4.2.
The flue must serve only one fireplace.
2.4.3.
Any damper or register plate should be
removed. If removal is not possible without carrying out
5
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