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FLUE PIPE TYPES
06.1 CHIMNEY COWL
A properly installed chimney cowl ensures optimum stove operation. 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.
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
Steel flue pipe with double chamber insulated with
material resistant to 400°C. Optimum 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
Traditional clay flue pipe with cavities. Optimal efficiency.
MAX A+1/2A
A
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