17
Ductless
Fume
Hoods
Chapter 4 – Installation
4.1
General
Requirements
4.1.1
Location
Requirements
Placing
the
fume
hood
in
a
proper
location
is
important.
Bad
location
may
affect
the
performance
of
the
workstation.
As
seen
in
the
chart,
your
equipment’s
internal
airflow
velocity
is
relatively
low,
when
compared
to
the
airflow
disturbances
potentially
caused
by
the
opening
of
a
door,
a
person
walking
by
or
a
direct
exposure
to
an
air
‐
conditioning
outlet.
These
external
airflow
disturbances
can
affect
the
proper
laminar
flow
of
the
fume
hood
and
impaired
the
protection
offered
by
the
workstation.
When
installing
the
fume
hood,
it
should
be
located
as
far
away
as
possible
from
sources
of
airflow
disturbance
and
in
an
orientation
which
optimally
shields
the
fume
hood’s
airflow
from
all
external
airflow
disturbances.
The
following
requirements
should
be
taken
into
account:
•
The
location
should
be
far
away
from
any
kind
of
heat
source
(heaters,
fan
converters,
etc.)
for
facilitating
optimum
operating
conditions.
•
There
should
be
adequate
space
left
for
cleaning
the
back
of
the
cabinet.
•
There
should
be
unobstructed
access
to
the
main
power
supply
point
.
4.1.1.1
Position
Requirements
Any
pedestrian
traffic
routes,
thoroughfares
or
walkways
should
be
at
least
1.0
m
(3’)
from
the
front
of
the
fume
hood
Allow
at
least
30
cm
(1’)
clearance
on
both
sides
of
the
fume
hood.
You
should
not
position
the
fume
hood
where
the
distance
between
the
aperture
and
any
doorway
is
less
than
1.5
m
(5’)
or
the
distance
between
the
side
panel
and
any
doorway
is
less
than
1.0
m
(3’).
Summary of Contents for Ascent max
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