5
d)
The relevant parts of the current editions of the following British
Standards:-
BS 715
BS 1251
BS 1289 Part 1
BS 1289 Part 2
BS 4543 Part 2
BS 5440 Part 1
BS 5440 Part 2
BS 5871 Part 2
BS 6461 Part 1
BS 6891
BS 8303
In the Republic of Ireland the installation must also conform with
the relevant parts of:
a)
The current editions of:-
IS 813
ICP3
IS327
b) All relevant national and local rules in force.
2.2
In the United Kingdom, as supplied, this appliance can be
installed in the following situations:-
2.2.1
To a fireplace complete with surround and hearth as shown
in figure 1 and complying with BS1251. The required fireplace,
hearth, debris catchment area and clearance dimensions are shown
in figure 1.
2.2.2
To a fireplace incorporating a twin walled metal flue box
complying with the constructional requirements of the current
edition of BS 715 and standing on a non-combustible base The
dimensions of the flue box must conform to the opening shown
in figure 2. For flue details see sections 2.3 & 2.4.
2.2.3
To a fireplace that has a precast concrete or clay flue block
system conforming to BS1289. 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
13,000mm
2
.
Older editions of BS1289 required a cross-sectional
area of 13,000mm
2
. The current revision of the standard requires
16,500mm
2
. 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
100mm.
The flue starter blocks should not be modified.
The current version of BS1289 recommends 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.
2.2.4
To a builder’s opening within the dimensions shown in figure 1.
* If internal width is greater than 440mm the
opening width must be reduced to not more
than 40mm to ensure adequate sealing to fire.
Fig. 2 Twin wall metal flue box
(Internal dimensions)
Fig. 1 Hearth & Fireplace Opening
** Does not apply to pre-cast flues - See
section 2.2.3
