
INSTALLER
28
SEALED INSTALLATION (TYPE C)
Coaxial flues (Ø 60/100)
Coaxial flues can be oriented in whatever direction is
most convenient for the room, provided the maximum
lengths specified alongside are respected.
b
Ensure that the flue gas vent pipe has a 1% slope
towards the boiler.
b
Use of flue pipes longer than the maximum speci-
fied alongside leads to a loss of heat output from
the boiler (see table alongside).
b
The boiler automatically adapts its ventilation sys-
tem to suit the type of installation and the length of
the flue. Never obstruct or partly choke the combu-
rent air intake pipe.
b
Use only flues specifically designed for use with
condensing boilers. Follow the instructions pro-
vided in the flue pipe kit to install the flues.
C13
C13
C13
C23
C53
B23P
B53P
C83
C63
C33
C43
B23P
Upstream fan. Comburent air intake
directly from the room where the
boiler is installed. Flue gas vent via
horizontal or vertical flues designed
to operate at positive pressure, with
air ventilation to room.
B53P
Upstream fan. Comburent air intake directly from
the room where the boiler is installed. Flue gas
vent via horizontal or vertical flues designed to
operate at positive pressure, with air ventilation to
room.
C13
Concentric wall vent. Twin flue pipes can also be
used, but the wall through-pipes must be concen-
tric or located close enough to be subjected to
similar wind conditions.
If twin intake and vent pipe terminals are used,
they must be positioned within a square of 50 cm.
C23
Concentric vent to shared flue (air intake and flue
gas vent via same concentric pipe).
C33
Concentric roof vent. Outlets as for C13. The lev-
els of the intake and vent apertures must be less
than 50 cm apart.
C43
Vent and air intake via shared twin pipes, sub-
jected to similar wind conditions.
C53
Separate wall or roof vent and air intake, in areas
of different pressure but never on opposite walls.
C63
Upstream fan. Comburent air intake and flue
gas vent without flue terminals. If terminals are
installed, they must conform to the requirements
of EN 1856.
C83
Upstream fan. Comburent air intake through wall
and flue gas vent to roof.
b
In Italy, refer to DPR 412 and UNI CIG 7129 stand-
ard.
Maximum straight length
of coaxial flue Ø 60/100
(m)
Pressure drop
(m)
45° bend 90° bend
7.85
0.5
0.85
b
Maximum straight length is the maximum length of
the flue without bends, terminals or joints.
b
Values referred to atmospheric pressure at sea level.
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