6
2.2
Chimney and fumes Pipe
The discharge of combustion products must be roofed and can take place in 3 different ways:
-
By external conduit, which must have minimal internal dimensions of 80mm diameter and using only insulated
pipes (double wall) stainless steel fixed to the wall (Figure 8).
-
By chimney, which must be internal in size no more than 200x200mm; otherwise or in case of poor condition
(e.g. cracks, poor insulation, etc.) it is recommended to insert inside the barrel a stainless-steel pipe of adequate
diameter that develops throughout its length up to the chimney (Figure 9).
-
By means of chimney or chimney siding, which for good operation, must have immediately downstream of the
boiler a vertical section of at least 1500mm of height and minimum horizontal sections, however having a total
width of no more than 4000mm with a gradient upwards of no less than 3% (Fig.10). In addition, for each 90-
degree curve it is recommended to extend the vertical stretch by one meter and for each horizontal section it
is recommended to extend the vertical section by 2 meters. In the case of vertical developments greater than 7
meters, it is necessary to use tubes of internal diameter greater than the fumes output of the boiler, which is
80mm. These connections, provided for by UNI 10683, ensure the evacuation of combustion fumes even in the
event of a momentary lack of electricity. (Figure 10).
Check then:
That there is a minimum draft of at least 10 Pa.
The fumes exhaust system must always end with a windproof chimney.
In the case of both an external chimney and a inner chimney, inspections should be provided for
periodic checks and cleaning, which must be carried out annually.
In case the fumes output pipes passed through a flammable material, coat it with an insulation (Class
A1) enough thick
E)
Intake combusting air
F)
Smokes pipe Ø100
A)
External fumes conduction coated double
wall minimum 1500mm Length
B)
Intake combusting air minimum section 100
cm2
C)
Intake ‘combustion air’ minimum section
100 cm2
D)
Door for inspection of fumes conduction.
