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INSERTO 60 – 70 – 70 To – 70 Pr – 70 H49
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 appliance; 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 appliances.
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
elements – it allows an
excellent discharge of the
smokes.
50 cm
2 m
1
m
6090710 Rev.10 – EN
pre- fabricated
10 m
H min.
α
(2)
Handicraft
chimney
cap.
The
right
section must be at least
twice
as
big
as
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.
(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.
> _ A
>A
0,5 m
(1)Ridge axis
(2)Roof
(3) Chimney cap for steel flue
output
with internal cone deflector of
smokes.
the
Picture 7
Picture 8
Picture 9
Picture 10
19
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