86
2.7
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. 10 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
.
2.7.1
Separate pipe accessories
Kit code 8089903 is supplied for this pur-
pose (fig. 11).
The sectored diaphragm is to be used
according to the maximum head loss
allowed in both pipes, as given in fig. 12.
85
Z
240
85
103
CA
CA
CS
16
0
11
5
ø80
ø80
Fig. 10
KEY
CA
Inlet
CS
Outlet
30 BFR
Z mm
190
Example of allowable installation calculation in that the sum of the head losses of the
single fittings is less than 15,5 mm H
2
O:
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)
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)
0,30
0,30
–
Outlet terminal
–
0,40
–
Inlet terminal
0,10
–
–
Doubler fitting
0,30
–
–
Roof outlet terminal L.1390
–
–
0,60
1
2
3
4
5
3
Fig. 11
KEY
1
Blind flange
2
Flue gas duct flange
3
Fixing screw
4
Gasket ø 125/95
5
Intake duct collar
Fig. 12
KEY
1
Separate pipes kit code 8089903
2
90° elbow MF code 8077404
3
90° elbow MF with take-off
points code 8077407
4a Extension L. 1000 code 8096000
4b Extension L. 500 code 8096001
5
Outlet terminal code 8089501
6
Int.-est. ring kit code 8091500
7
Inlet terminal code 8089500
8
45° elbow MF code 8077406
