Test Parameter

Objective

Maximum time interval

Test procedure*
and key aspects

Particle count test

Verifies cleanliness

6 months or 12 months depending on Class

Particle counter.

Readings and positions

Air pressure difference

Absence of cross- contamination

12 months

Measure pressure difference

Airflow volume

Verify air change rates

12 months

Measure supply and return air, calculate air change rate

Airflow velocity

Verify unidirectional airflow and or containment condition

12 months

Velocity measurement