Labconco Biological Safety Cabinets 30268 Series - Manual (Page 23)

Chapter 4: Performance Features and Safety Precautions
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Original instructions
Laminar Airflow
Laminar airflow is defined as the movement of a body of air in a single
direction, with a uniform velocity. In practice, the laminar downflow of air in
the cabinet captures any aerosol generated in the work area of the cabinet,
and directs it to the HEPA filters. In order to be true laminar downflow, a
number of individual downflow velocity test points (The Downflow Velocity
Profile) must be +/- 16 feet per minute (0.08 m/s) of the average of all the test
points. This is illustrated in Figure 4-2.
Figure 4-2