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Les langues disponibles
Monoblocco Ghisa-IRONKER-750
Should the flues have a square or rectangular section, internal edges must be rounded with a radius not lower than 20
mm. For the rectangular section, the maximum ratio between the sides must be = 1.5. A too small section causes a
decrease of the draught. It is suggested a minimum height of 4 m.
The following features are forbidden and therefore they endanger the good operation of the device: asbestos cement,
galvanized steel, rough and porous internal surfaces.
Picture 4 gives some examples of execution.
The minimum section must be 4 dm
2
200 mm or 6.25 dm
(for example 25 x 25 cm) for devices with diameter greater than 200 mm.
The draught created by the flue must be sufficient, but not excessive.
A too big flue section can feature a too big volume to be heated and consequently cause difficulties in the operation of
the device; to avoid this, tube the flue along its whole height. A too small section causes a decrease of the draught.
The flue must be properly spaced from any flammable materials or fuels through a proper insulation or an air
cavity.
It is forbidden to let plant piping or air feeding channels pass in the same flue. Moreover, it is forbidden to create
movable or fixed openings on the same for the connection of further other devices.
5.1. CHIMNEY CAP.
The draught of the flue depends also on the suitability of the chimney cap.
Therefore, if it is handicraft constructed, the output section must be more than twice as big as the internal section of
the flue. Should it be necessary to exceed the ridge of the roof, the chimney cap must assure the discharge also in
case of windy weather (Picture 7).
The chimney cap must meet the following requirements:
•
have internal section equivalent to that of the stack.
•
have a useful output section twice as big as the flue internal one.
•
be manufactured in such a way as to prevent the penetration of rain, snow, and any other foreign body in the
flue.
•
be easily checkable, for any possible maintenance and cleaning operation.
(1) Industrial chimney
cap with pre-fabricated
elements – it allows an
excellent discharge of
the smokes.
50 cm
2 m
1
m
6099751 Rev.08 – EN
2
(for example 20 x 20 cm) for devices whose duct diameter is lower than
(2) Handicraft chimney
cap. The right output
section must be at
least twice as big as
the internal section of
the flue (ideal value:
2.5 times).
(1) In case of flues side by side, a chimney cap must be higher
than the other one of at least 50 cm in order to avoid pressure
transfers between the flues themselves.
10 m
(1) The chimney cap must not show hindrances within 10 m
from walls, pitches and trees. Otherwise raise it of at least 1
m over the hindrance.
The chimney cap must exceed the ridge of the roof of at
least 1 m.
(3) Chimney cap for steel
flue with internal cone
deflector of smokes.
Picture 7
Picture 8
Picture 9
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