Air pattern or “smoke” studies
demonstrating laminarity and sweeping action over and away from the
product under dynamic conditions
should be conducted.
The studies should be
well-documented with written conclusions. Videotape or other recording mechanisms have
been found to be useful in assessing airflow initially as well as facilitating
evaluation of subsequent equipment configuration changes. However, even successfully qualified systems
can be compromised by poor personnel,
operational, or maintenance practices.
