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.
4.2.3
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 2.
4.2.4
A precast concrete or clay flue
block system conforming to BS1289
or BS EN 1806 with dimensions as in
figure 3 or using a 05654K1 spacer
kit. (Installation Instructions part
number 3003095). The current
versions of BS1289 and BS EN
1806 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 three metres,
restrictive terminations etc (See
figure3).
4.2.5
If the fireplace opening is
greater than the acceptable
dimensions given in this guide, do
not use the back of a fire surround
or marble to reduce the opening.
Page 9
INSTALLER GUIDE
©
Baxi Heating U.K. Limited 2007.
Figure 3. Precast or clay flue block system
dimensions
Figure 2. Metal flue box
