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5.0
Flues
The flue should be designed in
accordance with the local bye-laws
and the Clean Air Act. Draught
stabilisers are not recommended.
Sharp bends or horizontal runs
should be avoided and the flue
should terminate 2 feet (600 mm)
above the ridge of the dwelling.
Ter minals which restrict the
discharge or allow ingress of water
should be avoided.
It is recommended that when
connecting to an existing masonry
chimney a flexible stainless steel liner
of the correct diameter should be
used. The annular space must be
sealed top and bottom and filled with
insulation.
Materials used for the flue system
should be mechanically robust,
resistant in internal and external
corrosion, non-combustible and
durable under the conditions to which
they are likely to be subjected.
Prevention of condensation within the
flue should be an important factor in
the design of the flue system. In order to minimise condensation the use of double
walled flue pipe or insulation is recommended.
Where condensation in the flue is unavoidable, provision should be made for
condensate to flow freely to a point at which it can be released, preferably into a gully.
The condensate pipe from the flue to the disposal point should be of non-corrodible
material of not less than 22mm (in) size.
Facilities should be made for disconnecting the flue pipe from the air heater for
inspection and servicing purposes. Bends with removeable covers should be fitted for
inspection and cleaning purposes where considered appropriate.
The flue system should ensure safe and efficient operation of the air heater to which it
is attached, protect the combustion process from wind effects and disperse the products
of combustion to the external air.
The flue should terminate in a freely exposed position and must be so situated as to
prevent the products of combustion entering any opening in a building in such
concentration as to be prejudicial to health or a nuisance.
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