SUPER MAX - SUPER JUNIOR
18
7191051 – EN
•
not be throttled and show a vertical arrangement with deviations not greater than 45°;
•
if already used, it must be clean;
•
observe the technical data of the instructions manual;
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 appliance: asbestos cement, galvanized steel,
rough and porous internal surfaces. Picture 3 gives some examples of
execution.
The minimum section must be 4 dm
2
(for example 20 x 20 cm’s) for
appliances whose duct diameter is lower than 200 mm, or 6.25 dm
2
(for example 25 x 25 cm’s) for appliances 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 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 4).
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.
Picture 3
Picture 4
(1) AISI 316 steel flue with double
chamber insulated with material
resistant to 400°C.
Efficiency
100% excellent.
(2) Refractory flue with insulated
double chamber and external
coating in lightweight concrete.
Efficiency 100% excellent.
(3) Traditional clay flue showing a
square section with cavities.
Efficiency 80% excellent.
(4) Avoid flues with rectangular internal
section whose ratio differs from the
drawing.
Efficiency 40% poor
.
A+1/2A
A
Max.
A+1/2A
(3)
(1)
(2)
(4)
(1) Comignolo industriale
ad elementi prefabbricati,
consente
un
ottimo
smaltimento dei fumi.
(2) Comignolo artigianale.
La giusta sezione di uscita
deve essere minimo 2 volte
la sezione interna della
canna fumaria, ideale 2,5
volte.
(3) Comignolo per canna
fumaria in acciaio con
cono interno deflettore
dei fumi.
