16
Installation info
2.2.9 - DISCHARGE OF FLUE
GAS INTO
COAXIAL DUCTS
Ø 100/60 mm
Type C12
The minimum length of horizontal co-axial
ducts is 0.5 metres. The maximum allowable
length of horizontal co-axial ducts is 3 me-
tres; for each additional bend the maximum
allowable length must be reduced by 1 metre.
Moreover, the duct must have a downward dip
of 1% towards the outlet point to prevent rain
water from getting into the duct.
Type C32
The minimum length of vertical coaxial ducts
is 0.5 metres. The maximum allowable length
of vertical coaxial ducts is 4 metres exclu-
ding the stack (Ø80/125); for each additional
bend the maximum allowable length must be
reduced by 1 metre.
The diaphragm Ø 44 supplied with the boi-
ler must be inserted in the flue gas exhaust
pipe as shown in figure 13, for installa-
tions with horizontal coaxial pipe up to 1
m and with vertical coaxial pipe up to 2 m.
fig. 13
VERTICAL FLUE DUCT WITH
COAXIAL DUCT Ø 80/125
Tipo C32
The minimum length of vertical co-axial ducts
is 1,2 metres. The maximum allowable length
of vertical coaxial ducts is 6 metres exclu-
ding the stack (Ø80/125); for each additional
bend the maximum allowable length must be
reduced by 1 metre.
The diaphragm Ø44 supplied with the boi-
ler must be inserted in the flue gas exhaust
pipe, as shown in figure 14, for installa-
tions with a coaxial pipe up to 2,5 m.
fig. 14
Diaframma Ø 44 mm
Ø 60/100
Ø 80/125
Ø 80/125
Ø 80/125
Rubber foam
gasket
Up to 2 m
Up to 1 m
Up to 2,5 m
Rubber foam
gasket
Diaphragm
Ø 44
Diaphragm
Ø 44
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