Bedienungsanleitung La Nordica LUCY (Seite 19 von 56) (Deutsch, Englisch, Französisch, Italienisch)

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FIAMMETTA BII – GIORGIA BII – ASIA BII – FIORELLA BII – LUCY BII

7196601 – EN 19

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

(for example 20 x 20 cm’s)

for appliances whose duct diameter is lower than 200 mm, or

6.25 dm

(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

Picture 5

A+1/2A

Max.

A+1/2A

(3)

(1)

(2)

(4)

(1) AISI 316 steel flue with double

chamber insulated with material resistant

to 400°C. Efficiency 100% excellent.

(2) Refractory flue with double insulated

chamber and external coating in

lightweight concrete. Efficiency 100%

excellent.

(3)

Traditional clay flue square section

with cavities. Efficiency 80% excellent.

(4) Avoid flues with rectangular internal

section whose ratio differs from the

drawing.

Efficiency 40% poor.

(1) Industrial chimney cap

with pre-

fabricated

elements –

it allows an

excellent discharge of the

smokes.

(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).

(3) Chimney cap for steel

flue with conical deflector

of smokes.

50 cm

(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.

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