Nordica Focolare 70 Piano Instructions For Installation, Use And Maintenance Manual page 22

(1) (2)
(3) (4)
Max.
A+1/2A
It is suggested a minimum height of 4 m.
The following features are forbidden and therefore they endanger the good operation of the device:
asbestos cement, galvanized steel, rough and porous internal surfaces. Figure 5 gives some examples of
execution.
(1) Sportello
Door for
per
cleaning
pulizia
(2) Representation of a correct flue with air-tight
door for the collection and discharge of solid
unburnt materials.
Figure 6
The minimum section must be 4 dm
lower than 200 mm or 6.25 dm
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 device; 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.
22
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 .
A+1/2A 3) Traditional clay flue square section with cavities. Efficiency 80% excellent .
4)
Avoid flues with rectangular internal section whose ratio differs from the drawing.
A
Efficiency 40% poor .
SI
YES
2
(for example 20 x 20 cm) for devices whose duct diameter is
2
(for example 25 x 25 cm) for devices with diameter greater than 200
(1) The connection of more than one device to
the flue is not recommended.
Each device must have its own flue.
Figure 7
Instructions for installation, use and maintenance – EN – Rev.07
Cast iron fireplaces
Figure 5
NO