4.5.
Exhaust
line
In
the
case
of
all
types
of
dust
that
can
be
harmful
to
human
health
due
to
their
particularly
high
content
of
fine
dust
or
that
are
loaded
with
odorous
substances
or
solvents,
the
clean
air
must
be
discharged
outside.
In
certain
cases,
a
secondary
filter
may
be
required.
Material
We
recommend
that
you
use
exhaust
ductwork made
from
galvanized
sheet
metal
in
order
to
prevent
the
formation
of
rust
film.
Connection
to
device
The
connection
of
the
device
must
be
flexible.
A
rigid
connection
is
not
al
‐
lowed.
Cleaning
openings
In
horizontal
sections,
a
cleaning
opening
should
be
installed
every
9.8
to
16.4
feet.
They
are
also
required
in
the
vicinity
of
T
‐
pieces.
If
a
sound
absorber
is
installed
in
the
ductwork,
cleaning
openings
are
re
‐
quired
before
and
after
it.
Attachment
The
exhaust
line
must
be
secured
using
suitable
means
of
attachment
in
accordance
with
the
load.
The
ductwork
must
not
be
propped
up
by
the
device!
Potential
equalization
In
the
case
of
the
extraction
of
non
‐
conductive
dust,
the
exhaust
line
must
be
grounded
by
means
of
potential
equalization.
Seals
must
be
electrically
conductive.
Otherwise,
potential
equalization
sys
‐
tems
must
be
used
throughout
the
ductwork
system.
The
connection
of
multiple
potential
equalization
systems
to
a
single
at
‐
tachment
point
is
not
allowed.
Each
connection
must
be
individually
at
‐
tached
to
a
copper
bar.
This
bar
itself
must
be
grounded
with
the
switching
system.
Max.
pipe
length
The
exhaust
line
should
be
dimensioned
for
an
air
speed
of
33
ft/s.
A
max.
ductwork
length
of
33
ft
should
not
be
exceeded.
The
installation
of
two
90°
bends
is
also
possible.
Ventilation
‐
openings
In
exhausted
pathways,
which
were
not
laid
continuously
increasing,
but
partly
decreasing,
there
have
to
be
necessary
ventilation
‐
openings
as
well.
These
Ventilation
‐
openings
must
be
installed
as
covered
below:
The
Venti
‐
lation
‐
openings
have
to
be
tightly
closed
while
running
the
collector
and
they
also
have
to
be
open
by
stagnation.
