Figure
2.3:
Fume
extraction
flue
In
the
room
where
the
heat
generator
must
be
installed,
there
must
be
no
fume
‐
extraction
hoods
already
in
existence
or
installed,
in
order
to
avoid
depressing
the
atmosphere.
The
air
vents
must
not
be
closed.
Keep
the
flue
clean,
performing
a
cleaning
operation
at
least
once
a
year;
it
is
also
advisable
to
clean
both
the
flue
cowl
and
the
fume
pipe
connection.