Fitting To Metal Flue Boxes - Flavel Linear Installation, Maintenance & User Instructions

Table A - Installation Depth Requirements for a Flavel Kenilworth or Linear,
being installed into a brick built chimney, requiring 12.0 litres of debris
collection volume (figure 2)
When installing this product into a builders opening / brick-built chimney, the depth
required is a minimum of 170mm. The 12.0 litres of debris collection volume is
achieved by the space available taper down the sides of the firebox. This depth
can be reduced to 120mm if the black 50mm spacer frame is used (not suitable for
use with Linear models). This spacer frame can be purchased from Flavel Fires
as an optional extra. This appliance is suitable for use in fireplaces fitted with an
existing chairbrick without the need for removal of the chairbrick, providing the
minimum depth of the fireplace exceeds 260mm. If the depth is less than 260mm
then the spacer (optional) must be used to give a minimum clearance from the
rear of the fire to the rear of the chairbrick of at least 90mm to allow
sufficient space for the collection of debris which may fall down the chimney. The
fireplace must be checked to ensure that no part of the chairbrick is within 50mm
of the flue outlet of the fire when installed.
For example, if the appliance was to be fitted into a 370mm wide opening (without
a chairbrick), the depth required would be 170mm. See figure 2 below for
explanatory diagram.
Fig. 2
Depth Required
(e.g. 170mm
minimum)
Opening Width ( e.g. 370mm)
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 125mm internal
and minimum internal dimensions of 300mm deep by 580mm high by 400mm
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.
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