1500 Series A2 8-1
Thermo Scientific
Section 8
Certification Testing
For application in the USA, the unit has been rated as a Class II safety
cabinet, Type A2, in accordance with NSF/ANSI 49.
For operation as a unit of said classifications, a certification test and repeat
test in accordance with NSF/ANSI 49, Annex F should be completed at
the time of installation, and at least annually thereafter. As described in
Annex F, recertification should be performed whenever HEPA filters are
changed, maintenance repairs are made to internal parts, or the cabinet is
relocated. More frequent recertification should be considered when
working with safety-critical materials (three to six months).
Nominal value:
Default value as specified by Thermo.
Measured value:
Value measured at the location of the safety cabinet.
Tolerance:
Acceptable deviation from the nominal value.
Average value:
The sum of the measuring values divided by the number of tests. The
average value is compared to the nominal value.
Setpoint:
Acceptable operating value for the inflow and downflow velocities.
Inflow velocity (FPM):
Velocity of the air entering the sample chamber opening.
Downflow velocity (FPM):
Velocity of the displacement flow circulating through the work chamber.
Exhaust velocity (FPM):
Velocity of the airflow discharged through the exhaust filter opening.
Exhaust airflow volume (CFM):
Amount of air discharged at the exhaust filter.
Classification of the
Safety Cabinet
Test Terms
