La Nordica Monoblocco Ghisa 750 Piano [17/52] Ventilation hood or adjacent local

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

(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 40 ).

5.1. CHIMNEY CAP

The draught of the ue depends also on the suitability of the chimney cap.

• 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

6. VENTILATION HOOD OR ADJACENT LOCAL

The product can distribute heated air by natural convection or forced convection by means of a centrifugal fan; therefore, during installation,

it is necessary to establish the type of ventilation or convection to be adopted:

A) NATURAL CONVECTION:

To ease the natural circulation of air (upward movement due to the heating of the same) in the external enclosure of the stack, it is

necessary to remove the underlying semi-blanks (see Picture 12 at page 44).

By choosing this convection system, it is recommended not to install the electrical fan.

B ) FORCED CONVECTION:

c) Each pipe must not exceed 2 m of length for natural ventilation and 4 m for forced ventilation, and has to be insulated with insulating

materials to avoid noise and dispersion of heat.

d) The openings have to be positioned at a height not lower than 2 m from the oor to avoid that hot air at output meets people. Please

respect the distance of the convection openings according to the local construction norms;

e) The lengths of the canalization pipes must have the same length to avoid the distribution of differing quantities of air from each

output. ( (see Picture 13 at page 44).

6.1. 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