2.3
PREPARATION OF THE COMBUSTION CHAMBER OPENING
(INTO EXISTING CHIMNEY BREAST)
An opening should be constructed to the following dimensions in the existing
chimney breast. See figure 6 below.
Fig. 6
NOTE
: Please ensure that access holes are cut into either the sides or area
above the lintel to allow access to the flue pipe connection if using a flue liner.
Such access holes are also advantageous in installations where a flue liner is not
required as they provide access for servicing purposes.
If installing without a flue liner, please ensure that sufficient depth is available in
the opening to collect a minimum volumetric area of 12 litres (0.012m3) of flue
debris. This is achieved by a minimum depth of 385mm, the design of the outer
combustion chamber ensures this depth can be met.
Refer to figure 1 on page three for dimensions of the flue outlet.
CHECK ANY LOAD BEARING STRUCTURAL ITEMS ARE NOT
AFFECTED BY THE INSTALLATION OF THE PRODUCT. SEE FIG 6
OVERPAGE.
8
Opening Width = 750mm
Opening Height = 520mm
Minimum Depth 385mm
with or without liner
Lintle must
project 150mm
either side of the
opening if
cutting into an
existing chimney
breast
