2.2.1
Outside
wall
extraction
One
of
the
installation
solutions
that
may
be
adopted
is
that
of
placing
the
pellet
heater
close
to
an
outside
wall
of
the
room
so
that
the
fumes
are
extracted
directly
to
the
outside
(figure
2.4).
Hereafter
please
find
some
recommendations
reported
under
regulation
UNI
7129
referred
to
this
particular
plant:
‐
Always
guarantee
that
there
is
an
inspection
valve
(I)
that
will
allow
effective
and
periodic
cleaning
to
be
carried
out,
and
any
condensation
formed
to
be
eliminated;
‐
The
cowl
(T)
must
be
strictly
windproof
and
rainproof;
‐
Insulate
the
fume
extraction
flue
appropriately
in
the
section
where
it
goes
through
the
wall.
The
fume
extraction
flue
that
is
completely
outside
must
be
made
of
double
‐
wall
stainless
steel
in
order
to
guarantee
that
there
is
both
greater
resistance
to
atmospheric
agents
and
correct
fume
extraction
temperature.
Figure
2.4:
Outside
wall
extraction