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exhaust outlet
not blocked or restricted.
Blockage or
restriction under
the work surface
Ensure that the towel catch and
plenum beneath the work surface
are unobstructed.
Contamination of
work in the
cabinet
Improper technique
or procedure for
the Biosafety
Cabinet
See “Use of the Cabinet” section in
the manual.
Restriction of the
return air slots or
grille – blockage of
the exhaust outlet
Ensure that all return air slots,
grilles and the exhaust outlet are
unobstructed.
External factors are
disrupting the
cabinet airflow
patterns or acting
as a source of
contamination
See “Installation” section of this
manual.
Cabinet is out of
adjustment/HEPA
filter(s) are
defective
Have cabinet recertified.