1.7 FITTING TO PRE-FABRICATED TWIN WALL METAL FLUE BOXES
The appliance may be fitted to twin wall metal flue boxes conforming to the
constructional requirements of BS 715 / BS EN 1856-2, (for example the Selkirk
LFE 175 box). The box must have a minimum flue diameter of 175mm internal
and minimum internal dimensions of 170mm deep by 580mm high by 350mm
wide. There are no maximum dimensional requirements for the box. The top face
of the box must be insulated with a minimum thickness of 50mm of non-
combustible mineral wool insulation or similar material. The flue box must stand
on a non-combustible base of minimum thickness 12mm.
1.8 FITTING TO PRE-CAST FLUE INSTALLATIONS
When installing this appliance into pre-cast flues, always ensure that the
spigot restrictor baffle has been removed.
To install the fire box in to pre-cast flue starter blocks, there must be at least
170mm from the mounting face of the fire to the rear of the pre-cast flue
starter block
to allow sufficient space for debris
collection. It is important to consider this depth when choosing a fire surround as
the thickness of the fire surround must be sufficient to give a total depth of
at least
170mm to the rear of the starter block
, otherwise there will be insufficient depth.
If in doubt about the suitability of the fire contact BFM Europe Ltd for advice before
proceeding.
This fire has been designed to fit standard 100mm pre-cast
starter blocks with 3 inch rebated surrounds.
It is important to ensure that the pre-cast flue is in good condition and is free from
extruded mortar or sealant from between the flue blocks.
This appliance has been tested for use in a pre-cast flue block complying
with BS EN 1858. In accordance with BS EN 1858, pre-cast flues built with
directly plastered faces (front or rear) are not correctly installed as to ensure
proper operation with any type of gas fire. In some instances of this flue
construction, temperature cracking of surface plaster may occur through no
fault of the appliance. An air gap or some form of insulation material should
be installed to prevent normal flue temperatures from damaging wall
surfaces.
1.9
HEARTHS
This appliance must only be installed on to a concrete or non-combustible hearth.
The hearth material must be a minimum thickness of 13mm with the top surface at
least 50mm above the floor. The hearth must be fitted symmetrically about the fire
opening and have a minimum width of 760mm and a minimum projection of
300mm forwards from the fire opening. If the appliance is fitted with a black 50mm
spacer frame, then the hearth projection must be increased to 350mm forwards of
the fireplace opening.
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