Chimneys and Flues
The ue and chimney must be inspected before installation to ensure that it is suitable for the appliance being
tted. Chimney and ue systems must meet the requirements of the Building Regulations Document J.
Soundness of Flue
The ue must be sound and free from cracks and obstructions. New ues should be lined.
All ues should be swept clean prior to installation and inspected for soundness and freedom from
blockages.
Any ue liner must comply with the test requirements for ue liners for use with burning solid mineral fuels.
Flue Size / Dimensions
Weather the chimney is old or is newly built, its dimensions must be adequate to support the size of re to be
installed. The larger the re, the greater the size of ue and the taller the chimney required. When specifying ue
liners, ensure that the important internal dimensions are stated.
The minimum height of any ue must be 4.5m measured from the top of the re to the top of the ue. See the
installation data table on page 5 for recommended ue size and minimum chimney height.
Some res may operate successfully on ues smaller than the recommended sizes, but this is normally only the
case when the ue height is signicantly greater than the minimum recommended. No data is available for this
calculation.
The ue must not be used for any other appliance or application.
Use of Existing Chimneys
These must be swept and inspected for dimensions and soundness before starting to install the re. Existing ue
liners should be inspected and replaced if required.
Termination
It is important to terminate the top of the ue in such a way that it will allow free passage of combustion
products to the atmosphere without being subjected to turbulent air or high pressure zones that could cause a
downdraught.
Building regulations stipulate minimum clearance above windows and ventilation openings.
Pots should be simple, open topped and with the same internal diameter as the ue. 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. Thatch roofs need specialist advice. Please contact your chimney supplier.
Flue Outlet
Flow from the outlet must be totally free from any obstruction.
Bends
The ideal ue is straight and vertical. New chimneys must not deviate more than 45º from the vertical, but it is
desirable that the deviations do not exceed 30º. Bends greater than 30º should be avoided where possible. In
older chimneys bends exceeding 45º may be found and will degrade ue performance.
Sweeping
The chimney can be swept through the re. The re is provided with removable V board bafes to facilitate
chimney sweeping and for the removal of soot from the unit. The re must be installed in such a way that this
can be carried out.
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