Carcinogens
present
a
unique
chemical
deactivation
problem
and
the
standard
biological
decontamination
will not, be effective against
chemicals
or
other
non-biological materials.
With
materials
of this
kind,
consult
a qualified safety
professional.
Decontamination
procedure
Wamiitg!
This
procedure should be performed
by
qualified
technicians only.
1.
Surface-disinfect the inside of the viewscreen
and
all
other
surfaces
on
the viewscreen
assembly.
2.
Calculate
the
total
volume
of
the
cabinet
by
multiplying
the
height,
width,
and
depth.
3.
Multiply
the
total
volume
of the cabinet
by
0.3
g/ff
of
space to
determine
l~e
gram
weight
of
paraformaldehyde
required.
4.
If
the
cabinet
is
equipped
with
an
exhaust
duct,
this
duct
must
be
gas tight. This
may
be
accomplished
at
the
terminal
end
of the
duct,
or
if
present,
at the
damper
located
near
the
cabinet.
If
the
exhaust
duct
is
more
than
10 feet
long,
additional
parafonnaldehyde
may
be
needed
to
compensate
for the
increased
volume.
If
the
cabinet exhausts
into
a recirculating building
exhaust
system,
disconnect
the cabinet from the building
sysle.rn
and
fomt
a gas tight seal.
{Pb~stic
filrn
and
tape
may
be used.)
5.
If
the
cabinet
exhaust
air is
discharged
into
the
room,
tape
a plastic cover
over
the
exhaust
port.
A flexible hose
can
be
applied
to
an
opening
in the plastic cover to
exhaust
formaldehvde
gas
folhwing
decontam-
ination.
Ho\VC\-'er, the
end
of the flexible
hose
rnust
be
sealed
with pb.stic film
and
tc.1pe
during
decontamination. This flexible hose
can
be
directed
into the roorn,
another
cabjnet
or
hood
exhausts
ystem,
provided
the
exhaust
is
not
recin
..
lllated.
It
m_ay
also be
16
placed
out
a
window
to
exhaust
the
formaldehyde
gas.
6.
Place a
heating
device, such as a
commer-
cially available electric frying
pan
or
a
remote
formaldehyde
generator
/neutralizer,
with
the
themwstat
set at 450 to 475'F (232.2 to
246.1°C)
on
the
work
tray.
The
generator
mav
also be fitted to the side
wall
of
the unit.
Spread
the
paraformaldehyde
evenly
over
the
heating
surface of
the
frying
pan.
·.
Cautionr
The
auto-ignitio11
temperature
of
paraformal-
dehydeis
572oF
(300°C).
7.
Place a
hot
plate,
beaker
of
water,
and
temperature
and
humidity
indicators
on
the
cabinet
work
trily.
8.
Close the
opening
to the
work
area
with
heavy
gauge
plastic .film
and
tape.
Close all
possible leak areas,
such
as
the
exit
of
electrical cords,
the
a.rea
around
the
viewscreen, the
suction
slots,
and
the
jcmcti.on
of
the plastic film
and
cabinet.
9.
Determine
the
temperature
and
humidity
inside
the
cabinet.
10. The
temperature
should
be
21.1
cc
(70°F)
or
higher,
and
humidity
should
be
60
to
85%.
Use the
hot
plate
to
heat
the
beaker
of
water
until the desired
temperature
and
humidity
are
achieved.
11.
Plug
the
cord of
the
electric
frying
pan
into
an
outlet
not
installed
on
the
cabinet,
if
the
cabinet
is
not
outfitted
with
a
Formalin
v0porizer.
12. After
25%,
of the
paraformaldehyde
has
depolymerized,
tum
on
the
cabinet
blower(s)
for
10
to
15
seconds. Repeat
after
50%, 75%
and
100% of the
paraiomlaldehyde
has
depo!yrnerized.
!Vote-
\!\lith
the viezuscreen
sash
closed arul
the
blozvet on, a high flozv
condition
-will
raast
likely
exist. In
this
1node
the
audio
porlio11
of
the
ailflow
a/ann
is
disabled.
Y1w
unit
is safe
to
run in
this
fashion.
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