9
CS.ECO-TFT.IST-1-EN / Rev 1.0
ENGLISH
Chimney
The
chimney
is a device crowning the flue, used to ease dispersion of combustion products.
It must satisfy the following requirements:
-
It must have a usable outlet cross-section which cannot be smaller than double that of the flue onto which it is inserted;
-
It must be shaped in such a way as to prevent rainwater or snow from entering the flue;
-
It must be built in such a way as to ensure the discharge of combustion by-products even in the event of winds from every direction and
inclination.
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:
Distance > 5 m
Distance < 5m
Distance >1.85 m
Distance < 1.85 m
0.
5
m
Technical
volume
0.
5
m
1
m
m
in
im
um
Reflux
zone
15
°
0.
5
m
a
bove
th
e
high
est p
oint
