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CS.VTR.IST-1 / Rev 1.2
The flue and connection to the same
The flue is an essential element for the efficient operation of the appliance. The flue must have a minimum cross-sectional area as that indicated in the
technical specifications of the appliance (80 mm). Each product must be equipped with its own flue, without other adjoining elements (boilers, chimneys,
stoves, etc.). The flue dimensions are closely related to its height, which must be measured from the appliance flue gas outlet to the base of the stack. In
order to guarantee adequate draught, the surface of the chimney flue outlet must be double the flue cross-section. The discharge pipe for combustion
products generated by the forced draught device, must comply with the following requirements:
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It must seal off the combustion gases, as well as being waterproof and suitably isolated and insulated in relation to the conditions of use (refer to UNI
9615);
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It must be made of suitable materials capable of withstanding normal mechanical stress, heat, and the effects of combustion gases and condensate,
if any;
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It must go upwards after the vertical section, for the entire remaining part, with a minimum gradient of 5%. The sub-horizontal section must not have
a length greater than ¼ of the effective height H of the flue or chimney, and must not be longer than 2,000 mm;
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It must preferably have a round internal cross-section: square or rectangular cross-sections must have rounded corners with radius not inferior to 20
mm;
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It must have a constant, free and independent internal cross section;
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Rectangular cross-sections must have a maximum ratio of 1.5 between the sides;
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If the flue is installed externally, it must be insulated in order to prevent the flue gases from cooling and allowing condensation to form;
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Parts made from non-combustible materials (it is absolutely prohibited the use of aluminium flue) - capable of withstanding combustion gases
and potential condensation - must be used for mounting the flue gas pipes (for the section from the appliance to the flue inlet);
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It is forbidden to use fibre cement pipes to connect the appliance to the flue;
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Flue gas conduits must not pass through rooms in which the installation of combustion devices is prohibited;
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The flue gas conduits must be assembled in such a way as to guarantee adequate sealing of flue gases during low pressure operation of the appliance;
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The installation of horizontal sections is prohibited;
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It is prohibited to use counter sloping elements;
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The flue gas pipe must allow for the recovery of soot or be cleanable, and must have a constant cross-section;
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It is forbidden to allow other air intake conduits and system pipes to transit inside the flue gas pipes, even if they are over-sized.
FURTHER SPECIFICATIONS TO BE CONSIDERED
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The appliance works with the combustion chamber in depression and the flue pipe in pressure; it is essential that the flue gas outlet is hermetically
sealed.
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The flue pipes inside the installation room must be made of a suitable material
diameter of 80 mm.
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The pipes must have a double wall (thermally insulated) or be suitably insulated with rock wool. The maximum temperature of the flue pipe inside the
room must not exceed 70°C.
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IT IS MANDATORY TO HAVE AN INITIAL VERTICAL SECTION OF AT LEAST 1.5 MT IN ORDER TO GUARANTEE CORRECT FLUE GAS
DISCHARGE.
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Every direction change must be carried out with a T-shaped fitting and inspection cap. The tubes must be air tight through special seals which resist
up to 250° C. Attach the pipes to the wall with special collars to avoid any vibration.
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IT IS STRICTLY FORBIDDEN TO INSTALL DRAUGHT REGULATION VALVES (BUTTERFLY VALVES).
(see current regulations)
8
and equipped with seal gaskets with a minimum
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