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DIVA SLIM AIR PELLET STOVE
12
EN - Rev. 1.0
The flue and connection to the same
The flue is an essential element for the efficient operation of the appliance. The flue must have the minimum cross-
sectional dimensions stated in the appliance’s technical specifications (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:
- 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);
- It must be made of suitable materials capable of withstanding normal mechanical stress, heat, and the effects of
combustion gases and condensate, if any;
- 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;
- 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;
- It must have a constant, free and independent internal cross section;
- Rectangular cross-sections must have a maximum ratio of 1.5 between the sides;
- If the flue is installed externally, it must be insulated in order to prevent the flue gases from cooling and forming
condensation;
- Parts made from non-combustible materials - 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); it is strictly
forbidden to use flue pipes made of aluminium;
- It is forbidden to use fibre cement pipes to connect the appliance to the flue;
- Flue gas conduits must not pass through rooms in which the installation of combustion devices is prohibited;
- 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;
- The installation of horizontal sections is prohibited;
- It is prohibited to use counter sloping elements;
- The flue gas pipe must allow for the recovery of soot or be cleanable, and must have a constant cross-section;
- 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
- 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.
- The flue pipes inside the installation room must be made of a suitable material (see applicable regulations) and
equipped with sealing gaskets with a minimum diameter of 80 mm.
- 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.
- IT IS MANDATORY TO HAVE AN INITIAL VERTICAL SECTION OF AT LEAST 1.5 M IN ORDER TO GUARANTEE
CORRECT FLUE GAS DISCHARGE.
- Every direction change must be carried out with a T-shaped fitting and inspection cap. The pipes must be smoke-
tight thanks to special seals capable of withstanding temperatures of up to 250°C. Secure the pipes to the wall with
special collars to prevent any vibration.
- IT IS STRICTLY FORBIDDEN TO INSTALL DRAUGHT REGULATION VALVES (BUTTERFLY VALVES).