Remove
existing
insulation
Construct
an internal
re-
inforcing
wall
Construct an
internal
overlapping
re-inforcing
wall
Apply
special
insulation
material
External wall
contains
combustible
insulation
YES
RECOMM
ENDED
NO
YES
External wall
is 150mm
thick & non-
combustible
NO
NO
NO
YES
Internal wall
contains
slightly
combustible
material
NO
NO
YES
YES
Lightweight
internal wall
in non-
combustible
material
NO
NO
RECOMME
NDED
YES
CONVECTION AIR
Air arrival for Convection:
At the base of the chimney (convection chamber) it is necessary to allow for air intakes of
400cm² cross=sectional area.
The air intake can either be beneath the unit (taking care it would not be restricted by the
storage of firewood) or by means of vents on the side walls, either side of the insert.
Perforated metal plates could even be built into the side walls of the chimney to allow for
the air arrival.
Circulating the Convected Air:
The air convected on the inside of the chimney (around the insert) must be allowed to
circulate out of the cavity as much as possible – a build-up of hot air in the cavity must be
avoided.
The air that comes in for convection is also the air that comes in for combustion and the air
intakes on the insert must never be restricted. The arrival of fresh clean air for combustion is
very important and this can even be allowed for using dedicated flexible liners that bring
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