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– With direct intake from outside, when
the pipe is longer than 1 m, you are
recommended to insulate the piping so
as to prevent formation of dew on the
outside of the piping during particularly
hard periods of the year.
– With the outlet pipe outside the building
or in cold indoor environments, insulation
is necessary to prevent burner failure in
starting.
In such cases, provide for a condensate-
collector system on the piping.
– If a segment of the flue passes through
a flammable wall, this segment must be
insulated with a glass wool pipe insula-
tor 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 (excluding the doublers) and
must not be greater than 7,00 mm H
("25" version) and 11,00 mm H
version).
For head losses in the fittings, refer to
Table 2.
2.8. 1
Separate pipe
accessories
Kit code 8093000 is supplied for this pur-
pose (fig. 8).
The sectored diaphragm is to be used
according to the maximum head loss
allowed in both pipes, as given in fig. 8/a.
The complete range of accessories neces-
sary for satisfying all installation require-
ments is reported in fig. 9.
"25 BF" version
Sectores diaphragm
Total head loss
to remove
mm H
O
2
1
0 ÷ 2
2
2 ÷ 3
4
3 ÷ 4
6
4 ÷ 5
Remove diaphragm
5 ÷ 7
"25 BF"version B22 type
Sectores diaphragm
Total head loss
to remove
mm H
O
2
1
0 ÷ 1
2
1 ÷ 2
3
2 ÷ 4
4
4 ÷ 5
5
5 ÷ 6
6
6 ÷ 7
Remove diaphragm
7 ÷ 8
TABLE 2
Accessories ø 80
90° elbow MF
45° elbow MF
Extension L. 1000 (horizontal)
Extension L. 1000 (vertical)
Outlet terminal
Intake terminal
Doubler fitting
Roof outlet terminal L. 1390
Tee condensation outlet
Example of allowable installation calculation "25 BF" version) in that the sum of the head
losses of the single fittings is less than 7,00 mm H
7 m horizontal pipe ø 80 x 0,20
7 m horizontal pipe ø 80 x 0,30
n° 2 90° elbows ø 80 x 0,30
n° 2 90° elbows ø 80 x 0,40
n° 1 terminal ø 80
O
2
O ("30"
2
Total head loss
With this total head loss, remove the ø 38 baffle from the intake pipe.
Pa
0 ÷ 19,6
19,6 ÷ 29,4
29,4 ÷ 39,2
39,2 ÷ 49,0
49,0 ÷ 68,6
Pa
0 ÷ 9,8
SECTOR OF DIAPHRAGM
9,8 ÷ 19,6
19,6 ÷ 39,2
39,2 ÷ 49,0
49,0 ÷ 58,8
58,8 ÷ 68,6
68,6 ÷ 78,4
Head loss (mm H
"25 BF" version
Inlet
Outlet
Roof outlet
0,30
0,40
–
0,20
0,30
–
0,20
0,30
–
0,,30
0,20
–
–
0,30
–
0, 1 0
–
–
0,20
–
–
–
–
0,50
–
1,00
–
O:
2
Inlet
Outlet
1,40
–
–
2, 1 0
0,60
–
–
0,80
0, 1 0
0,30
2, 1 0
+
3,20
=
120
KEY
1 Sponge-rubber gasket ø 125/95
2 Fixing screw
3 Air-smokes flow splitting unit with take-off points
4 Sectores diaphragm ø 38
"30 BF" version
Sectores diaphragm
to remove
mm H
1
2
3
4
5
6
Remove diaphragm
O)
2
"30 BF" version
Inlet
Outlet
Roof outlet
0,30
0,50
–
0,20
0,40
–
0,20
0,40
–
0,30
0,30
–
–
0,40
–
0, 1 0
–
–
0,30
–
–
–
–
0,60
–
1, 1 0
–
=
5,3 mm H
O
2
=
Fig. 8
Total head loss
O
Pa
2
0 ÷ 2
0 ÷ 19,6
2 ÷ 3
19,6 ÷ 29,4
3 ÷ 4
29,4 ÷ 39,2
4 ÷ 5
39,2 ÷ 49,0
5 ÷ 6
49,0 ÷ 58,8
6 ÷ 7
58,8 ÷ 68,6
7 ÷ 11 68,6 ÷ 107,8
Fig. 8/a
87
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