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POSITIONING EXAMPLES
7.3 DIMENSIONING OF AIR TUBES
COMBURENTE / FUMES DISCHARGE
MEC MIX series hot air generators can be installed in
one of the following ways:
- installation type C13: product unloading of
combustion and air sampling comburent occur on
the wall through ducts separated (see Fig. 18 and
19) or coaxial (see Fig. 20). In this way the
appliance is watertight compared to the room in
which it is installed.
- installation type B23: this type includes the
combustion air intake in the environment and
exhaust of the fumes on the outside wall through a
specific horizontal duct (see Fig. 23 e 24) or on the
roof through a special duct vertical (see figures 25
and 26). installation type C53: the discharge of
products of combustion and the intake of
combustion air they take place through separate
conduits that flow outside the building and distant
from each other. This type allows to realize, to
example, the air intake in the wall behind the
appliance and the fume exhaust far away from the
appliance or to the roof (see Fig. 21 e 22). In this
way the appliance is watertight to the room in which
it is installed.
- C33 type installation: product unloading combustion
and the intake of combustion air they take place on
the roof through coaxial pipes (see Figure 27).
In this way the appliance it is tin compared to the
room in which it is installed.
- C63 type installation: this type allows to realize
fume exhaust / air sampling systems using tubes,
curves and terminals retrieved from trade, provided
that they are approved. Also, lets use duct
diameters greater than 60 mm: for example when
it is necessary to realize very long air / smoke
systems. With this type, for the calculation of the
system air fume must also refer to the data provided
by the pipe constructor, as well as the composition,
at the smoke flow and temperature (see Table 12).
In any case, use approved ducts according to the
type of installation to be carried out.
The material used for the flue gas exhaust duct
must be of class W1 according to the UNI EN 1443
standard and therefore suitable for resisting the
action of the condensates of combustion products
from gaseous fuels.
If you use ducts other than those supplied by
manufacturer, make sure that these are suitable for
the type of the device on which they are installed.
In particular, the temperature class of the duct must
be appropriate to the operating characteristics of the
apparatus.
To size the pipe system it is necessary to calculate
the equivalent length of the fumes exhaust pipes and
air. For each model and for each configuration of
exhaust fumes, the maximum lengths are shown of
linear pipes.
29
Fig.16
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