Performed to determine the average air flow velocity/volume and uniformity of air flow within a unidirectional area of cleanroom as well as the total airflow provided.

To ensure and confirm that the HEPA filter system is properly installed by verifying the absence of bypass leakage in the installation and that HEPA filters are free of defects.

Performed to determine the actual particle count level within the facility at time of test.

To verify the capability of the HVAC system to maintain the specified pressure differentials

Establish the airborne sound pressure levels produced by clean room HVAC and electrical systems within the clean room or clean spaces and in adjacent occupied areas to verify that performance and sound levels meet the specifications.

To demonstrate the capability of the HVAC system to control temperature uniformity and humidity within specified limits.

Verify that the defined lighting level and lighting uniformity meets the specified requirements.

Performed to determine the amount of time that is necessary for non-unidirectional clean rooms or clean spaces to reach a specified steady cleanliness level after a system shutdown or power failure.

Performed to determine if there is intrusion of unfiltered air into the clean work areas from outside the cleanroom enclosure through joints, cracks, doors and product entry points into critical work areas.

To measure the levels of large particles which are not detected effectively using airborne optical particle counters.