Baxi 748 Installer's Manual page 9

3.2.1.1 'Hole-in-the-wall' Installations
It is recommended that a hearth should be installed as in figure 1.
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Chic, Envy, Heritage and Westminster models.
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If a hearth is not 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
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 147mm. The
minimum shelf height will have to be taken from the base of the fireplace opening.
Luxor and Opulent models.
If a reduced depth hearth is fitted 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
72mm. 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
147mm.
To protect from the risk of burns and ignition of clothing a tactile separator shall be
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used. The hearth detailed in section 3.9 meets the requirements for a tactile separator. If
this is not used then a 625mm 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.
3.2.2 To a fireplace incorporating a metal
flue box conforming to BS EN 1856 Part 1 or
BS 715 with a minimum internal depth of
150mm. Incombustible mineral wool
insulation of not less than 50mm thickness
must be applied to the top surface of the
hotbox (See figure 2) and it must stand on a
non-combustible hearth (See figure 1).
3.2.3 To a fireplace that has a precast
concrete or clay flue block system
conforming to BS1289 or BS EN 1806. The
appliance is suitable for installations
conforming to older versions of BS1289 as
well as the current edition. The flue blocks
must have a minimum width not less than
63mm and a cross-sectional area not less than
©
Baxi Heating U.K. Limited 2006.
INSTALLER GUIDE
Page 9
Figure 2. Metal flue box
72mm. Where