Chimneys
New chimneys may be constructed using chimney blocks, insulated tubular sections or clay
liners within brick or stone. Weather the chimney is old or is newly built, its dimensions must
be adequate to support the size of fire to be installed. The larger the fire, the greater the size of
flue and the taller the chimney required. When specifying flue liners, ensure that the important
internal dimensions are stated. Some fires may operate successfully on flues smaller than
the recommended sizes, but this is normally only the case when the flue height is significantly
greater than the minimum recommended. No data is available for this calculation.
Use of Existing Chimneys
These must be swept and inspected for dimensions and soundness before starting to install
the fire.
New Chimney Breasts
Where a new chimney breast is to be built, the Jetmaster flue gather and adapter may be used
in achieving connection to the flue. The components are available for Universal, Low and Extra
Units
Dimensions
See the installation data table on pages 1 & 2 for recommended flue size and minimum chimney
height.
Soundness of Flue
The flue must be sound and free from cracks and obstructions. New flues must be lined.
All flues should be swept clean prior to installation and inspected for soundness and freedom
from blockages.
Soot Doors
The Fires are provided with removable throat restrictors to facilitate chimney sweeping and for
the removal of soot from the top of the unit. However, the provision of a soot door into the flue
will make sweeping easier.
In inglenooks where register plates are fitted, a soot door should be provided in the register for
cleaning out soot falls above this level. On outside walls, an external soot door can be fitted so
the chimney can be swept from the outside. The throat restrictor flap can then be closed during
sweeping and the soot removed by vacuum (from above).
Termination
The top of the flue should be well clear of turbulence and downdraught and preferably higher
than any overshadowing building or tree within 15m. Building regulations stipulate minimum
clearance above windows and ventilation openings. Pots should be simple, open topped and
with the same internal diameter as the flue. Unconventional pots or terminals must be so
designed that will operate satisfactorily in all wind directions. Take steps to prevent birds nesting
in the terminal.
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