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The area immediately behind the firebox must be separated from the combustible
elements of the inner wall by 25mm thickness of non combustible material.
This can consist of the usual 13mm plasterboard wall lining plus 12mm of "Superlux"
or similar non-combustible material - see figure 12.
Fixing the appliance in position
There are two methods of fixing that may be used:
1. Cable Retention
2. Use of fixing brackets
If the fire is to be fitted in front of the wall, then fixing
brackets may be used. If this is the case, then refer to the
section entitled "Securing firebox to wall using fixing
brackets" further on in this manual.
If the cable fixing method is used, it will be necessary to
install the eyebolts now. This is achieved as follows :
•
Working from the centre of the flue hole, mark up four
holes as shown in figure 13.
•
Drill the fixing holes to a minimum depth of 42mm
using a 7mm masonry drill.
•
Insert four fibre wallplugs (supplied in loose parts
pack).
•
Now firmly screw in four eyebolts (also supplied in loose parts pack).
Provision for main loom
It may be necessary to cut a groove in the flue hole to ensure that there is
adequate clearance for both the flue tube and the electrical loom. A trial
installation of both is recommended.
The groove should be cut in the lower left hand side of the hole.
(Electrical control assembly side). See figure 14.
Alternatively, a separate electronic cable access hole of 25mm may be
preferred, and should be positioned as shown in figure 15.
Prepare flue assembly
Measure the total wall thickness from the outside surface
to the inside face. Add 18mm to this measurement to
obtain the correct length of flue unit required. This
measurement is for surface mounted flue box assemblies.
Care should be taken if the flue box is to be recessed. The
fan box is not intended to be recessed into a timber framed
building.
Measure the flue length from the inner flue tube at the
appliance end (staggered end) and mark the cut point on
the outer pipe of the fan end (Pipes are flush).
Insert the polystyrene ring between the inner and outer
tubes to support them and cut both tubes squarely at the
marked distance. Remember cut only the fan end , the flush
fitting end.
Important: Remove all packaging from the flue unit (e.g. front coal)
Remove all polystyrene from the flue unit after cutting.
Now the flue tube is ready for installation.
Fig. 13
Fig. 14
Fig. 15
13
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