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INSERTO 70 L
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
10 m
1
m
6096700 – EN
(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.
(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
H min.
(1)Ridge axis
α
(3) Chimney cap for steel
flue
deflector of smokes.
0,5 m
(2)Roof
with
internal
cone
Picture 7
Picture 8
Picture 9
Picture 10
19
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