Chimney Cap - LA NORDICA MIGNON Instructions Pour L'installation, L'utilisation Et L'entretien

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 2 gives some examples of
execution.
The minimum section must be 4 dm
is lower than 200 mm, or 6.25 dm
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 3).
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) Comignolo industriale
ad elementi prefabbricati,
consente
smaltimento dei fumi.
50 cm
18
2
(for example 20 x 20 cm's) for appliances whose duct diameter
2
(for example 25 x 25 cm's) for appliances with diameter greater
un ottimo
(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.
(2) Comignolo artigianale.
La giusta sezione di uscita
deve essere minimo 2 volte
la sezione interna della
canna fumaria, ideale 2,5
volte.
MIGNON
(3) Comignolo per
canna fumaria in
acciaio con cono
interno deflettore dei
fumi.
Picture 3
Picture 4
1190000 – EN