User manual

Page 13
The appliance can be installed as in A2 and
sealed around the sides, top and the cavity with
Rockwool to prevent any combustible material
falling onto the surfaces or the rear of the hot
box and flue duct.
The cavity must also be sealed around the sides
and top of the hot box with a non-combustible
materia1 or insulated board as shown in Fig. 14.
A suitable hearth and surround must be fitted or
constructed.
C 1
Where a flue is to be installed in a timber frame
dwelling care must be taken to protect
combustible material from contact with the hot
surfaces of the hot box and flue. It should be
fitted in accordance with the guidelines
stipulated in the DM2 (2nd edition) document
printed by British Gas.
The requirements regarding the location of
appliance and surround are the same as in A1
although special consideration should also be
given to the position of any vertical studwork.
When a suitable location is found between
vertical supports that allows the flue heat shield
to be fitted and also satisfy the flue terminal and
surround requirements. Position the fire on the
hearth or equivalent thickness that meets with
the requirements in A1, mark around the outline
of the hot box to find the centre line, measure up
from the proposed hearth level 630mm. Measure
and mark a rectangle for the heatshield as shown
in Fig. 15. When plasterboard is used, the weight
of the appliance must be supported on the hearth.
Carefully remove the rectangular section
avoiding damage to the vapour barrier behind
the plasterboard. Cut the vapour barrier
diagonally and fold back for access to the
insulation quilt, cut the quilt and the inner timber
sheathing the same size as the rectangle. Mark
and drill the outer wall as shown in Fig 6, and as
stated in A1.
When fitting appliances with circular flues into
existing timber framed houses, a drip collar
should be used. One can be constructed by
wrapping a wire (of a material that will not
promote corrosion) tightly around the assembly,
and twisting the ends together underneath the
duct.