18
3.5
SEPARATE DUCTS
(Optional alternative twin pipe system)
When installing the separate ducts, comply with the
requirements of the current standards, as well as the
following practical pointers:
– With direct intake from outside, when the pipe is longer
than 1 m, you are recommended to insulate the piping so
as to prevent the formation of condensation on the outside
of the piping during particularly cold periods of the year.
– With the outlet pipe outside the building or in cold indoor
environments, insulation is necessary to prevent burner
ignition failure. In such cases, provide for condensate
drainage.
– If a segment of the flue passes through a flammable wall,
this segment must be insulated with a glass wool pipe
insulator 30 mm thick, with a density of 50 kg/m
3
.
The maximum overall length of the intake and exhaust
ducts depends on the head losses of the single fittings
installed and can reach approximately the following
horizontal measures:
– 15 m for “Format 80 B” model,
– 21 m for “Format 100 B” model.
For head losses in the fittings, refer to
Table 7.
1
2
3
4
6
165
110
165
K
ø 80
ø 80
100
92
Fig. 18
KEY
1 Sponge-rubber gasket
ø 125/95
2 Fixing screw
3 Smoke outlet flange
4 Air intake diaphragm
6 Manifold with intakes
80 B
100 B
K mm
185
210
Fig. 18/a
N° segments
Total load loss mm H
2
O
to remove
25 BF
30 BF
none
0 ÷ 3,0
0 ÷ 3,0
n° 1
3,0 ÷ 4,0
3,0 ÷ 4,0
n° 2
4,0 ÷ 5,0
4,0 ÷ 5,0
n° 3
5,0 ÷ 6,0
5,0 ÷ 6,0
n° 4
6,0 ÷ 7,0
6,0 ÷ 7,0
n° 5
6,0 ÷ 7,0
7,0 ÷ 8,0
n° 6
7,0 ÷ 8,0
8,0 ÷ 9,0
n° 7
7,0 ÷ 8,0
9,0 ÷ 10,0
n° 8
8,0 ÷ 9,0
10,0 ÷ 11,0
n° 9
8,0 ÷ 9,0
11,0 ÷ 12,0
n° 10
-
12,0 ÷ 13,0
without diaphragm
9,0 ÷ 10,5
13,0 ÷ 14,0
Summary of Contents for Format B
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