Labconco Purifie Horizontal Clean Benches 38185 Series, 8' - Manual (Page 21)

Chapter 4: Theory of Operation 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 horizontal laminar flow of sterile air in
the clean bench flushes out any aerosol generated in the work area of the bench.
This sterile airflow maintains the sterility of sterile items inside the clean bench.
In order to be true laminar flow, a number of individual velocity test points (The
Velocity Profile) must be +/- 20 % of the average of all the test points. This is
shown graphically in Figure 4-2.
Motor/Blower
The motor/blower assembly pulls air through the prefilters on the top of the
bench, and flows through the HEPA filter, which then flows horizontally through
the work area.
Figure 4-2