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5.1 GENERAL
5.1.1
Make sure that the installation will comply with all the relevant
requirements in part 2 of this manual.
5.1.2
Attempt to keep the hole sizes as close to the minimum dimensions as
possible in order to minimise the sealing required
5.1.3
Make sure that the damp course or any electrical wiring, piping etc in the
wall is not affected when cutting the installation hole.
5.1.4
Any gas supply pipe installed in the wall, floor or cavity of a cavity wall
must be continuous and enclosed in a factory fitted gas tight sleeve (Ref: Gas
safety (Installation & Use) Regulations 1994 as amended & Certificate of
exemption no.1 1996)
5.2 BRICK, STONE ETC. BUILDING. CONVECTION BOX
IN FRONT OF WALL
(Figure 6)
5.2.1
This installation is for use with a
fire surround or false chimney breast
having a minimum depth of 114mm
(4½in.). The maximum possible
surround depth will depend on the
wall thickness bearing in mind that the
terminal must project at least 15mm
beyond the external face of the wall to
allow the end cover to be removed and
refitted during servicing.
5.2.2
Combustible material within a
false chimney breast must be at least
75mm from the convection box.
5.2.3.
The non-combustible hearth
must project at least 345mm in front
of the convection box front flanges
and be at least 620mm wide (Figure 6).
5.2.4
Make a hole through the wall to
cater for the flue box (Figure 6).
The bottom of the hole must be at the
same level as the top surface of the
hearth.
5.2.5
In almost every case, it will not
be necessary to support the hole with a
lintel. If, however the wall is of poor construction
seek expert building advice before commencing to
cut the hole.
5.2.6
The cavity should be sealed where the flue
box hole has been cut. We recommend filling
fully across the cavity with Rockwool or
equivalent to at least 100mm above and each side
of the opening. Fill at the bottom of the opening
to the level of the hearth/fireplace floor. See figure
7.
Figure 7 Cavity sealing
P A R T 5 :
W A L L P R E P A R A T I O N
Figure 6
