INSTALLATION METHOD 33 ((continued)
the fire is off. Where the flue pipe passes through the inner leaf, a hole 100mm larger in diameter than the flue
should be cut to allow an annular 50mm air gap around the flue circumference and a none combustible flue
sleeve must be fitted.
A layer of insulation material will be needed behind the cavity box, between the combustible wall and the 50
mm of rear insulation, to protect the inner leaf of the wall. A piece of 12 mm thick 'Supalux' or equivalent
should be fitted to do this. The vapour barrier on the back of the inner leaf should be cut and carefully pinned
to prevent any damp ingress.
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When setting the appliance into the wall, find a suitable position between frame timbers and open up the
hole. Secure back the damp proof membrane to prevent ingress of damp. A drip collar of twisted galvanised
or stainless steel wire should be formed around the flue with twist on the underside of pipe to disperse drips
of water that may otherwise track back down the flue pipe to the appliance.
Again, 50mm insulation must be provided between combustible materials and the sides and rear of the con-
vector box and the flue tube and 100 mm of insulation to the top of the convector box. The exposed cavity
should be sealed off using non-combustible board ('Supalux' or equivalent) made into a 4 sided box, rear, 2
sides and a top. Note that the appliance should not be allowed to bridge the cavity in this installation method.
FLUE PPREPARATION
When the preparation work for the chosen installation method has been completed and the fire surround (if
any) has been fitted, the flue can be prepared. The flue length calculation by measurement is quite straightfor-
ward but requires care and attention in getting an accurate result. Always double check to make sure the
measurement you have come up with is not too short - it is not possible to rejoin flue pipe cut off too short.
Always take into account that the whole terminal cage must project from the outside wall by its full 87.6mm
length.
Measure the distance between the front face of the marble or finished inner wall face that the fire is to be
mounted against, and the surface of the outside wall. Now deduct 100mm from that dimension and write it
down. This measurement is now the length that the flue must be cut to as measured from the end of the ter-
minal cage (the very end of the duct) towards the other end of the duct that connects to the fire. Fit the sup-
port ring inside the flue pipe, mark off and cut the duct. The inner Flue duct must be cut at a length, which is
25mm longer as shown above
De-burr the cut ends of the flue pipe to allow a good connection to be made with the fire.
A
ALWA
AYS BBE SSURE TTO RREMOVE TTHE PPOLYSTYRENE SSUPPORT RRING BBEFORE FFINA
ALLY FFITTING TTHE FFLUE
PIPE TTO TTHE FFIRE.
GAS SSUPPLY
When the opening is ready for installation of
the fire, the gas supply can be routed as shown
in the following diagram.
Temporarily fit the cavity box and offer up the
firebox assembly to ensure a suitable gas route
can be achieved.
FINAL C
CAVITY BBOX FFITTING
If not previously carried out, insert the cavity box into the opening and mark the screw locations required for
fixing. Remove the cavity box and drill the previously marked holes in the opening or constructional hearth
area and fit rawl plugs.
Carefully insert the cavity box into the opening and guide the gas pipe through the sealing grommet into its
final routing position and fit the Restrictor inlet elbow supplied to the gas pipe. Secure the cavity box by insert-
ing screws in the previously prepared locations.
The cavity box may also be fitted using the cable fixing kit supplied as detailed below.
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1.0
1.0
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