5 for appliance dimensions).
!
To protect from the risk of burns and ignition of clothing a tactile separator shall be
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
BS715 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
firebox (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 1858.
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 13,000mm2. Older
editions of BS1289 required a cross-
sectional area of 13,000mm2. The current
revision of the standard requires
16,500mm2. This appliance is suitable in
both cases. The total depth of the
opening measured from the finished front
of the fireplace (Including plaster,
surround etc.) must be
not less than
120mm
(See figure 3)
.
The current versions of BS1289 and BS
EN 1858 recommend that there should be
an air space or insulation between the
flue blocks and the plaster because heat
transfer may cause cracking on directly plastered flues. However, generally this
appliance is suitable for installations under all circumstances unless there is a history of
cracking problems. Remember that faults such as cracking may be caused by poorly
built and restrictive flues, e.g. mortar extrusions, too many bends, flue heights below
Page 9
INSTALLER GUIDE
©
Baxi Heating U.K. Limited 2007.
Figure 3. Pre-cast fireplace
