www.charltonandjenrick.co.uk
31
LT5052 (ISS 5)
Method 2: when setting the appliance into the inner timber leaf of the wall
The following amendments should be incorporated:
Find a suitable position between the wall panel frames and carefully open up a hole to allow the fixing of the
cavity box referred to below, paying careful attention to securing the damp proof membrane back into position.
The cavity box should be constructed from 12mm “Superlux” or equivalent material with minimum internal
dimensions of height 700mm, width 470mm and a depth of 225mm. This box should not bridge the cavity but if
this cannot be avoided then a waterproof membrane must be placed between the rear of the cavity box and the
outer skin of the dwelling. If this membrane is combustible or there are any other combustible materials located
behind the cavity box then a hole of 200mm diameter must be cut in the back face of the box. A 200mm
diameter metal sleeve concentric with the appliance flue must be provided to pass through all the non-
combustible layers of the wall construction. This sleeve must be a tight fit into the hole at the rear of the cavity
box and must not overhang the cavity by more than 5mm.
If there are no combustible materials behind the cavity box (the sleeve will not be required) cut a 100mm
diameter hole through the back face of the cavity box ensuring that it is a tight fit over the flue pipe.
The vapour barrier on the back of the inner timber leaf should be carefully cut and fixed to prevent ingress of
damp into the plasterboard layer.
The void around the appliance sides, back and flue when it is positioned inside the cavity box and sleeve must be
packed with “Rockwool”, the top must be packed with 100mm of “Rockwool” note the “Rockwool” must not
overhang the cavity.
The Fanbox must not be installed into any combustible materials if the outer layer of the wall is not brick, stone
or any other non combustible material then it must be surface mounted using the fanbox spacer (this is not
supplied as standard) with a 12mm “Superlux” pad between the Fanbox spacer and the outside surface of the
combustible wall. Further, the 200mm diameter sleeve would need to be extended so that it finishes flush to the
outer surface of the wall.
NOTE: Neither the cavity box nor the Rockwool insulating pad may overhang the cavity space.
CHECKING GAS SOUNDNESS
Check for gas soundness in accordance with the current code of practice
FUEL BED LAYOUT
Important:- Refer to the Health & Safety Notice located on page 5 of this booklet
before cleaning or
replacing any refractory material.
Lay loose coals, pebbles or driftwood pieces as shown in pages 7 to 14.
ENSURE COALS, PEBBLES OR DRIFTWOOD PIECES ARE PLACED AS INDICATED IN THESE INSTRUCTIONS.
