84
2.5.3
Coaxial duct outlet
on the roof
The roof discharge terminal L. 1280 cannot
be shortened and when positioning the tile,
the minimum distance from the discharge
head terminal must not be less than 600
mm (fig. 6).
The accessories to be used for this type of
installation and some of the connecting
systems that may be adopted are illustra-
ted in fig. 7.
It is possible to insert up to a maximum of
three extensions and reach a maximum
rectilinear distance of 3.7 meter.
Should it be necessary to make two chan-
ges of direction in the pipe development,
the maximum length of the pipe must not
exceed 2 meter.
2.6
SEPARATE PIPES ø 80
A special kit may be used to separate the
flue gas outlet from the fresh air intake.
The intake may be installed to the right or
left of the flue gas outlet.
Both ducts may be oriented in any direction.
Refer to fig. 8 for positioning.
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 15,5 mm H
2
O.
For head losses in the fittings, refer to
Table 2
.
KEY
1 Tile with articulated joint
2 Lead panel
3 Collar
4 Locking screw
Fig. 6
Fig. 7
KEY
1 Vertical extension L. 200
with take-off points code 8086904
2 Extension L. 1000 code 8096100
3 Tile with articulation joint code 8091300
4 Roof outlet terminal L. 1280 code 8091200
5 Supplementary 90° elbow code 8095800
15
5
Ø 80
Ø 80
10
5
24
5
130
CA
215
330
CS
KEY
CA
Inlet
CS
Outlet
Example of allowable installation calculation in that the sum of the head losses of the
single fittings is less than 15,5 mm H2O:
Inlet
Outlet
7 m horizontal pipe ø 80 x 0,20
1,40
–
7 m horizontal pipe ø 80 x 0,30
–2,10
n° 2 90° elbows ø 80 x 0,30
0,60
–
n° 2 90° elbows ø 80 x 0,40
–0,80
N° 1 terminal ø 80
0,10
0,30
Total head loss
2,10
+
3,20
=
5,3 mm H
2
O
TABLE 2
Accessories ø 80
Total head loss (mm H
2
O)
DEWY 30/80
Inlet
Outlet
Roof outlet
90° elbow MF
0,30
0,50
–
45° elbow MF
0,20
0,40
–
Extension L. 1000 (horizontal)
0,20
0,40
–
Extension L. 1000 (vertical))
0,10
0,30
–
Outlet terminal
–0,40
–
Inlet terminal
0,10
––
Doubler fitting
0,50
1,80
–
Roof outlet terminal L.1240
––
0,60
Fig. 8
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