6
GENERAL INSTALLATION REQUIREMENTS
This appliance is not suitable for installation in a room or internal space containing a bath or shower or where steam is regularly present or
in a private garage.
This appliance is suitable for the following: -
1. A masonry chimney with a minimum diameter of 175mm (7”) free from any obstruction, and with any damper or restrictor plate in the
chimney removed or secured, and having a minimum effective flue height of 3m (10ft). Note the relevant flat surface area requirement
(Figure 1). A masonry chimney having a correctly installed flue liner to BS715 and with a minimum flue diameter of 125mm is also
acceptable. Chair brick removal may not be required providing at least 50mm clearance is available from the flue outlet to any
fireplace component. The appliance is designed to cater for low lintel installations (min height 505mm) providing a minimum distance
of 25mm is maintained between the lintel and the front face of the fireplace (i.e. 25mm rebated fire surround).
2. 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 118mm
(Figure 2)
.
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.
3. A
sheet metal flue system conforming with BS4543 or BS715, the flue
diameter being a minimum of 125mm (5”) (see Figure 3) 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 system firebox, as shown in figure 3.
Figure 2 Pre-cast Fireplace
Figure 1 Masonry Fireplace
Figure 3 Factory Made Flue System
