Differential Air Pressure (DAP) services are part of our complete cleanroom certification services.

An air pressure differential test is used in many types of spaces to isolate a process or object via airflow. A  positive pressure space  is designed to direct differential air away from a protected area to prevent contaminants from entering (e.g., an ISO Class 8 clean area should be protected from contaminants from environments that are below an ISO Class 8 cleanliness level.) Conversely, a negative pressure  space  is designed to direct differential air into an isolated area to protect the environment from contact with the interior of that space. (e.g., the spaces surrounding a toxic product or infectious agent should be protected from the contaminated area.)

To test these critical elements, PMS uses differential air pressure gauges, called nanometers, that are fully calibrated by a Swiss accredited third party laboratory to  maintain our impartiality . Audit-ready calibration certificates are provided with your final report.

The goal of cleanroom qualification is  to demonstrate the performance of a space from a process perspective . This information, along with other variables (air velocity and volume, TRH, flow visualizations, etc.), provides important information on where to place continuous monitoring locations. It is important to identify and test the most critical and vulnerable locations in the process to  maintain control of the environment . Differential air pressure is a critical measurement required to effectively qualify a cleanroom or area and to create an environmental monitoring plan  based on risk analysis . (according to ISO 14644 and Annex 1) Our highly trained PMS technicians perform these tests and use the information collected as one part of an overall picture that characterizes the environmental risks to the clean area.