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Technical data
The dimensions of the shafts must ensure a minimum gap between the outer wall of the smoke duct and the inner wall of the shaft: 30 mm
for circular section shafts and 20 mm in the event of a square section shaft (Fig. 27).
Maximum 2 changes of direction are allowed on the vertical section of the flue system with a maximum clearance angle of 30° with re-
spect to the vertical.
The maximum vertical extension using a Ø 60 ducting system is 13 m, the maximum extension includes 1 bend Ø 60/100 at 90°, 1 m of
horizontal pipe Ø 60/100, 1 x 90° Ø 60 ducted bend and the roof terminal for ducting.
To determine the C
flue system in configurations other than that described (Fig. 29) one must consider that a 1-metre ducted pipe ac-
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cording to the indications described has a resistance factor equal to 4.9.
The maximum vertical extension using a Ø 80 rigid ducting system is 28 m, the maximum extension includes 1 adapter from Ø 60/100 to
Ø 80/125, 1 bend Ø 80/125 of 87°, 1 m of pipe Ø 80/125 in horizontal, 1 x 90° ducted bend Ø 80 and the roof terminal for ducting.
To determine the C
flue system in configurations other than that described (Fig. 29) one must consider the following head losses:
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- 1 m of concentric pipe Ø 80/125 = 1 m of ducted pipe;
- 1 87° bend = 1.4 m of ducted pipe.
Consequently one must subtract the equivalent length of the part added to the 28 m available.
C
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29
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