La Nordica Focolare 100 Bifacciale [21/56] Chimney cap
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La Nordica Focolare 100 Bifacciale [21/56] Chimney cap

La Nordica Focolare 100 Bifacciale [21/56] Chimney cap
FOCOLARE 100 BIFACCIALE
6097700 - IT-EN-DE-FR 21
5. FLUE
Essential requirements for a correct operation of the device:
• the internal section must be preferably circular;
• be thermally insulated and water-proof and produced with materials suitable to resist to heat, combustion products and
possible condensates;
• 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 ues 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 device: asbestos cement, galvanized steel,
rough and porous internal surfaces. In Picture 3 at page 43 gives some examples of execution.
The minimum section must be 4 dm
2
(for example 20 x 20 cm) for devices whose duct diameter is lower than 200 mm or 6.25 dm
2
(for example 25 x 25 cm) for devices with diameter greater than 200 mm.
The draught created by the ue must be sufcient, but not excessive.
A too big ue section can feature a too big volume to be heated and consequently cause difculties in the operation of the device; to avoid
this, tube the ue along its whole height. A too small section causes a decrease of the draught.
ATTENTION: as far as concern the realisation of the ue connection and ammable materials please follow the requirements provided by
UNI 10683 standard. The ue must be properly spaced from any ammable 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 ue. Moreover, it is forbidden to create movable or xed
openings on the same for the connection of further other devices (Picture 4 at page 44 ).
5.1. CHIMNEY CAP
The draught of the ue 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 ue.
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 5 at page 44 - Picture 6 at page 45).
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 ue internal one.
• be manufactured in such a way as to prevent the penetration of rain, snow, and any other foreign body in the ue.
• be easily checkable, for any possible maintenance and cleaning operation
5.2. CONNECTION TO THE FLUE / AIR FOR COMBUSTION (external air intake)
The connection to the stack must be performed with stiff pipes in aluminized steel with a minimum thickness of 2 mm or in 316 stainless
steel with a minimum thickness of 1 mm.
It is FORBIDDEN to use metallic pipes or pipes in asbestos cement since they jeopardize the safety of the tting itself, considering
that they are subject to tears or breaks resulting in leaks of smoke.
The exhaust pipe must be air-tight fastened to the stack and can have a maximum inclination of 45°; this to avoid excessive deposits of
condensate produced in the initial start-up phases and/or the excessive gripping of soot and moreover it avoids the slowing down of the
smokes at output.
The failed tightness of the connection can cause the malfunction of the device.
The internal diameter of the connection pipe must be equal to the external diameter of the smokes stub pipe of the device. This is assured
by the pipes complying with DIN 1298.
For a better working of the appliance, it is suggested to have a ue draught of 12 Pascal (=1.2 mm of column of water).
The measurement has always to be carried out with hot device (rated thermal performance).
When the depression exceeds 17 Pa (=1.7 mm of column of water), it is necessary to reduce the same by installing an additional draught
regulator (buttery valve) on the exhaust pipe or in the chimney, according to the regulations in force.
IMPORTANT: When using metallic pipes, they must be insulated with proper materials (coatings in insulating bers resistant up
to 600°C) in order to avoid deterioration of walls or of the counter-hood.
It is necessary to ventilate continuously the space included between the upper part, the sides of the device and the deector of the re-
proong material of the hood. For this reason, it is necessary to foresee an intake of air from the bottom (intake of fresh air) and a high
output (output of hot air). The spaces foreseen for the circulation of air indicated in Picture 7 at page 46 - Picture 14 at page 48 represent
the minimum requirements:
Top: Minimum opening 1000 cm
2
Base: Minimum opening 750 cm
2
In this way, the following targets are achieved:
• a greater safety
• an increase of the heat created by air circulation around the device.
ATTENTION: We recommend making the counterplate in re-retardant plasterboard with self-supporting metal frame, so that its weight
does not bear on the aesthetic covering (marble). We recommend providing an inspection door on the counter plate or elsewhere as
suitable to provide easy accessibility and visibility of the safety devices (pressure gauges, valves,..).
The heat vent grating (Picture 7 at page 46 pos. 6) has to be installed on the upper part of the hood at about 20 cm from the roof. This must
always be installed since its function is that of letting the heat collected within the hood (overpressure) ow out into the room.

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