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4.7
The hearth and back panel must be made from a non-combustible material although
‘lightweight’ and tiled surrounds can be used provided they have a minimum heat rating
of 150
o
c. Consideration should be given to the effect of expansion and contraction caused
by temperature. Back panels should be allowed to float or attached with flexible mastic
on the extreme edges.
4.8
The hearth must be a minimum of 12mm thick with the top surface standing a minimum
of 50mm above surrounding floor level or surrounded by a raised fixed fender of 50mm
high. The hearth must extend a minimum of 100mm in front of the fire bed and 100mm
either side giving an overall width of 600mm.
4.9
The fire front supplied with the appliance must be used. Any other type could affect
combustion or overheat the gas controls.
4.10
If fitting into an existing fireplace or flue, the flue and cavity MUST be blocked off
completely and the supplied cavity box fitted, this is to help prevent suction on the back
of the appliance. (The cavity box is not air tight and its installation does not negate the
need to seal any existing chimney or flue)The top of the flue should also be capped off to
prevent the entry of moisture etc, consult building control if in any doubt.
4.11
If fitting into an opening in a cavity wall, a void or false chimney breast, create a sealed
chamber for the fire to fit into and then use cavity box supplied. Failure to do so can result
in the pull from the cavity causing heat build up on the fire surround, back panel or
moisture ingress from the cavity.
4.12
Any under grate draught devices must be sealed off.
4.13
If using the fire in a hole in the wall application (more than 150mm above floor) a small
hearth 50mm deep will be required to support the fire front. No other hearth is required.
For all other applications, use the hearth sizes in 4.8.
4.14
Closure plate tape and foam seals are unsuitable for fixing and sealing the fire into place.
Always fix with the fixing cables or through the base of the fire.
5.
CLEARANCES TO COMBUSTIBLE MATERIALS AND SHELVES
5.1
A non combustible shelf may be fitted to within 50mm of the top edge of the fire frame.
Note that shelves will get hot and delicate ornaments, wax candles etc should be kept
away from hot surfaces.
5.2
The wood of the fire surrounds may be fitted to within 100mm of the sides of the firebox
provided it protrudes no further forward than 100mm. Any combustible side walls must
be at least 500mm from the fire bed.
Maximum depth of shelf
100mm
150mm
200mm
Minimum distance from…
250mm
300mm
350mm
…top of frame to underside of shelf.
As with all heaters the possibility of convection staining on surfaces in the vicinity of the
appliance shall be considered and the user advised. Particular attention should be taken
to ensure soft furnishings such as scatter rugs and curtains are kept at least 1 metre from
the appliance.
A
C
B
D
E
Outer wall
Inner
wall
Cavity
Surroun
d
Marble
Gas supply routes when fire is
inset into the cavity wall
A = Through wall – Pipe
must be sleeved and
sealed to fire
B & D = Sleeve pipe
behind surround and seal
to fire
d
