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40
Chimney
The chimney is a device crowning the flue, used to aid the
dispersion of combustion gases.
It must satisfy the following requirements:

It must have a usable outlet cross-section no less than
double that of the flue onto which it is inserted;

In must be shaped in such a way as to prevent rainwater
or snow from seeping into the flue;

Be built in such a way that, even in the event of winds
from every direction and inclination, combustion exhaust
is ensured.
The outlet height (where height refers to the top of the flue,
regardless of any chimney stacks), must be outside of the so-called
reflux zone, in order to prevent the formation of counter-pressures
preventing the free discharge of combustion by-products into the
atmosphere.
It is therefore necessary that the minimum heights - indicated in the
following diagrams - are observed:
Volume
tecnico
0
,5
m
0
,5
m
Distanza > 5 m Distanza < 5 m
Distanza> 1,85 m
Distanza< 1,85 m
0
,5
m
o
lt
re
il
c
o
lm
o
Zona di
reflusso
1
m
m
in
im
o
1
5
°