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3.2.8 100/60 mm diametre coaxial
duct air/flue system
Type C12
Minimum permissible length of hori-
zontal coaxial pipes is 0.5 metre not
including the first elbow connected to
the boiler. Maximum permissible length
of horizontal coaxial pipes is 4 metre
not including the first elbow connected
to the boiler. For each additional elbow
maximum permissible length must be
reduced by 1 metre. In addition, the
duct is to have a 1% slope to prevent
rainwater entering it.
Choosing the applicable diaphragm
supplied with the boiler (pic. 12)
Type C32
Minimum permissible length of vertical
coaxial pipes is 1 metre, equal to the
length of the chimney.
Maximum permissible length of verti-
cal coaxial pipes is 4 metre, including
the terminal.
For each additional elbow, maximum
permissible length must be reduced
by 1 metre.
Choosing the applicable
diaphragm supplied with the boi-
ler (pic. 12)
RTFS 24 and CTFS 24
219
330
100
97
750
450
7 mm
COAXIAL DUCT FLUE GAS DICHARGE
SYSTEM CONFIGURATION
pic. 13
FROM 0.5 m T
O, 4 m
pic. 12
DIAFRAMMA
TAPPO DI
CHIUSURA
SEALING
CAP
GUARNIZIONE
IN NEOPRENE
Pipe length (m)
Flue gas discharge
diaphragm
0.5 < L < 1*
Ø 40
1 < L < 2*
Ø 42
2 < L < 4*
Ø 45
* excluding the first elbow connected to the boiler
Pipe length (m)
Flue gas discharge
diaphragm
0.5 < L < 1*
Ø 41
1 < L < 2*
Ø 44
2 < L < 3*
Ø 45
3 < L < 4*
Ø 47
* excluding the first elbow connected to the boiler
Pipe length (m)
Flue gas discharge
diaphragm
1 < L < 2
Ø 42
2 < L < 4
Ø 45
RTFS 28 and CTFS 28
RTFS 24 and CTFS 24
Pipe length (m)
Flue gas discharge
diaphragm
1 < L < 2
Ø 44
2 < L < 3
Ø 45
3 < L < 4
Ø 47
RTFS 28 and CTFS 28
DIAPHRAGM
NEOPRENE
GASKET
SEALING
CAP