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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 fig. 3 below
Fig. 3
See note on
bottom of page
6 regarding
clearance for
collection
hood above
opening
Minimum Height 510mm
Maximum Height 525mm
Check any load bearing structural items are not affected by the installation of the
product, as shown below. (Fig. 4)
Fig. 4
600mm load triangle
400mm interactive area
Minimum Width 610mm
Maximum Width 650mm
Opening in Chimney Breast
10
Lintle must
project 150mm
either side of the
opening if
cutting into an
existing chimney
breast
Minimum Depth 305mm if fitting
with liner, 385mm without liner
The Interactive Zone -
Openings, beams or joists within
this area need to be assessed.
Load triangle - No beam or
opening permissible within this
area
Lintel
e.g. 750mm x 75mm
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