Types of flue pipe
Examples of flue pipe:
INCORRECT INSTALLATION
Exhaust pipes must never be fitted pointing downwards or horizontally so that fumes are discharged directly through the external wall.
03.3 CHIMNEY
A properly installed chimney cowl ensures optimum stove functioning. The anti-downdraught chimney cowl consists of a number of components whose outlet
section sum always doubles the flue pipe section. Make sure the chimney cowl is at least 150cm above the roof rise so that it is fully exposed to the wind.
The chimney cowls must:
•
have useful outlet section that is at least twice that of the flue pipe.
•
be made in such a way as to prevent the penetration of rain or snow.
•
be constructed in such a way as to ensure, in the event of winds coming from any direction, the evacuation of combustion products.
•
be free of mechanical intake auxiliaries.
Steel flue pipe with
double chamber
insulated with material
resistant to 400°C.
Optimum efficiency.
Traditional clay flue pipe
with cavities. Optimal
efficiency.
Refractory flue pipe with
insulated double chamber
and external coating in
lightweight concrete.
Optimal efficiency.
Avoid flue pipes with
internal rectangular
section whose ratio
between the larger and
smaller side is greater
than 1.5. Poor efficiency
Roof pitch α
[°]
Horizontal width of reflux
zone measured from rise A
[m]
Minimum height from roof
for discharging exhaust
fumes H min =Z+0.50m
Height of reflux zone Z [m]
15
1.85
1.00
0.50
30
1.50
1.30
0.80
45
1.30
2.00
1.50
60
1.20
2.60
2.10
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