6
nullify any NHBC cover relating to the property. If in doubt, guidance should be
requested from your local authority planning or building department.
2.4
This appliance must be mounted with a non-combustible hearth (n.b
conglomerate marble hearths are considered as non-combustible). The fire box
and fan box must be mounted on a non-combustible surface. The hearth must
project at least 345mm forward of the convection box front and be at least
620mm wide (See illustrations in “wall preparation” section. The hearth
material must be at least 12mm thick. The periphery of the hearth (or fender)
should be at least 50mm above floor level to discourage the placing of carpets or
rugs over it. For timber framed buildings the hearth must be at least 50mm deep
over all its area so that the clearance box can be satisfactorily installed.
The surface of the hearth must be sufficiently flat to enable the bottom of the
front surround, the burner bracket and the bottom front cover casting to be
aligned horizontally. Any excessive unevenness (uneven tiles, Cotswold stone,
etc.) should be rectified.
The appliance must not stand on combustible materials or carpets.
2.5
The appliance must not be fitted directly against a combustible
wall.
If the appliance is to be fitted against a wall with combustible cladding or
skirting board, such materials must be removed from the area covered by the
metal outer surround of the appliance. We suggest that the actual surround is
used as a template to mark the area for combustible cladding removal.
The appliance can be fitted to a purpose made proprietary class “O” 150°C
surround.
2.6
The opening in the surround or wall recess for the convection box must
be within the limits shown in figure 1(c)
2.7
The minimum allowable distance from the outside edge of the metal
front surround of the appliance to a corner wall having combustible materials is
178mm at either side.
2.8
The front face of the wall should be reasonably flat over the area which
will be covered by the convection box top and side flanges to ensure a good
seal.
2.9
The minimum height from the top surface of the hearth to the underside
of any shelf made from wood or other combustible materials is as
follows:-
•
For a shelf up to 150mm deep
•
Minimum height = 750mm.
•
For a shelf deeper than 150mm
•
Minimum height = 750mm + 12.5mm for every 25mm depth over
150mm.
2.10
Note that soft wall coverings (e.g. embossed vinyl, etc.) are easily affected
by heat. They may scorch or become discoloured when close to a heating
appliance. Please bear this in mind when installing.
2.11
The appliance must not be installed in any room which contains a bath or
shower or where steam is regularly present.
