Rizzoli ST - Chimney Flue

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2.4 DIMENSIONS AND CORRECT FORMS OF CHIMNEY
Chimney must be dimensioned in a correct way according to the type of device it is connected
with, minding the environmental and general conditions of the place in which it is placed. The
section of the chimney must permit the flow of the fumes produced by the cooker or thermal
cooker without difficulties, but it must not be too big otherwise the chimney will experience
problems in heating itself and this may generate problems like weak draught and condensation. In
table 1 it is indicated the recommended diameter for the flue according to the model of device
and to the height of the chimney (H). The height of the chimney must be enough to insure the
draught necessary to the chosen model. Bigger is the height of the chimney, bigger is the draught;
if the chimney is lower than 4 m (13,2’), the correct working of the cooker is not insured. The
chimney must not have tortuous parts, horizontal parts or counterslope parts; the number of
bends must be reduced to minimum. In picture 4 you can see some examples of good and bad
chimney connection.
Picture 4 - Samples of correct and incorrect chimney connection.
Table 1 - Indications for the dimension of the chimney according to its height.
Model L - S LT - ST
ø entrance 130 mm (5,1”) 140 mm (5,5”)
ø flue
H < 4 m (13,2’)
Draught not
guaranteed
Draught not
guaranteed
ø flue
4 m (13,2’) < H < 6 m (19,7’)
160 mm (6,3”) 180 mm (7,1”)
ø flue
H > 6 m (19,7’)
150 mm (5,9”) 160 mm (6,3”)
Necessary chimney draft
12 Pa
(0.0482wc)
12 Pa
(0.0482wc)
Picture 5 - H dimension for the sizing of the
flue.
2.5 CHIMNEY FLUE
The flue must be well isolated and circular if possible. The flue must not have defects, narrowings
or losses. All the inspection doors must be closed and well sealed. The connection of other devices
to the same chimney is not allowed.