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Directional Airflow
Directional airflow also plays a key role in cabinet performance. Air is drawn into the
front of the cabinet at the front grille. This “curtain” of air makes it more difficult for
aerosols to escape out of the work area of the cabinet and into the outside environment.
This airflow is often calculated and referred to as the Inflow Volume or Average Inflow
Velocity. This is illustrated in Figure 5-2.
Cabinet Air Intake (Front Grille)
The location, size, and pattern of the grille openings in the work area affect cabinet
containment and performance. The front grille’s airfoil profile, and air intake openings
play an important role in establishing Directional Airflow, as described previously. See
Figure 5-2.
Note: Do not block or obstruct the grille openings of the biosafety cabinet.
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