3.10.1.1
‘Hole-in-the-wall’ Installations.
It is recommended that a hearth should be installed as in figure 4.
If a reduced depth hearth is fitted, the fire must be installed so that the distance
from the base of the fireplace opening in the wall to the finished floor level is at least
100 mm. It is recommended that the reduced hearth has a depth from the fixing plane
of the fire of 100mm minimum. This is necessary to support the lower front casting.
Where there is no floor covering or carpet and the floor is of a type that is likely to be
covered in such a way in the future then the distance from the base of the fireplace
opening in the wall to the floor level should be increased to at least 175mm.
To protect from the risk of burns and ignition of clothing a tactile separator shall be
used. The hearth detailed in section 3.8 meets the requirements for a tactile
separator. If this is not used then a 672mm long fender, kerb, horizontal bar, or other
barrier, being fixed not less than 50mm above floor level and positioned 300mm in
front of the fixing plane of the fire will meet the requirement.
3.10.2
Metal flue box and hearth.
To a fireplace incorporating a metal flue box complying with the constructional
requirements of the current edition of BS715. The dimensions of the flue box must
conform to those shown in figure 6. The top of the metal flue box must be covered
with a 100mm layer of mineral wool or equivalent insulation (See figure 6).
Important Note
: Where the
flue box has a base sheet that
is single wall (i.e. a single
metal sheet) the flue box must
be mounted on a non-
combustible hearth. The hearth
material must be at least
12mm thick.
Page 15
©
Baxi Heating U.K. Limited 2009.
INSTALLER GUIDE
Figure 6. Metal flue box dimensions
