Cleanroom Testing Services

Cleanrooms, Critical Work Environments and associated Controlled Environments provide for the control of airborne particulate contamination to levels appropriate for accomplishing contamination-sensitive activities important to all aspects of everyday life. Products and processes that benefit from the control of airborne contamination include such industries as aerospace, microelectronics, pharmaceuticals, medical devices, hospitals/associated healthcare facilities and food.

We have over 30 years of experience in designing, building, maintaining and consulting in addition to certifying cleanroom and associated critical environments all over the world. Our extensive experience allows us to take our testing services to the next level. We not only certify your critical environment, but we can, in most cases, diagnose certification issues and offer solutions on how to rectify the situation while on site in the same visit. When you begin to see your particle counts rising and are maybe on the verge of not passing your next cleanliness class certification, there is no other company you would rather have in corner than Controlled Environments Group, LLC.

We know your critical environments are of the utmost importance to your day-to-day operations. We take their certification and maintenance seriously. That is why we test your facility with industry established methods according to standard practices and procedures so that when we are done you can be assured your facility is as clean as we say it is. We are cost conscience and will work with your quality control group to perform the minimum amount of testing required for your business to claim its desired cleanliness class rating. We pride ourselves on being customer driven and therefore, can offer any combination of the testing methods below to ensure your facility is tested to your satisfaction.

Our Critical Environment testing services include:

Filter Airflow/Volume Measurement: Ensures that all HEPA filters/Fan Powered HEPA Filters are in proper working condition. Establishes reference data so facilities maintenance department knows when filters need replacement.

Room Air Change Per Hour Rate: When desired or required, we can establish the critical environment’s “air changes per hour rate” to confirm proper or desired air exchange rates are being achieved.

“In-situ” Leak Testing: Testing is performed to confirm filters are not damaged or deteriorating, free of defects, are properly installed by verifying there is an absence of bypass leakage in the filter assembly or grid system.

Filter Pressure Drop Measurement:  Establishes initial filter drop through HEPA filter for new installations or for when an existing facility is purchased. Monitoring/ recoding filter pressure drop on a regular basis will provide another tool for facilities maintenance and quality control departments to “trouble-shoot” cleanliness class achievement problems should they arise.

Non-Viable Particle Counting: Airborne particle count measurement, per ISO 14644, for classification and test measurement of cleanrooms and clean air devices.

Air Balancing:  Measure and adjust airflows in the air handling systems to achieve design airflow in order to establish specified room air change rates leading to achieving design differential pressure cascade in the critical work environment to minimize contamination infiltration and cross contamination

Temperature and Humidity: To determine the capability of the environmental control system to maintain design air temperature and moisture levels (expressed in relative humidity)

Airflow Direction Test and Visualization: To confirm airflow direction and its uniformity to conform to design and performance specifications.

Electrostatic and Ion Generator Tests: The test consists of two parts. One is the electrostatic test and the other is the ion generator (ionizer) test. Electrostatic test evaluates the level of electrostatic charge voltage on a work or product surface and the dissipation rate of electrostatic voltage of the floor, workbench top or other installation component. The static-dissipative property is evaluated by measuring surface resistance and leakage resistance on the surfaces. The ion generator test is performed to evaluate the performance of ion generators by measuring the discharge time of initially charged monitors and by determining the offset voltage of isolated monitoring plates.


CEG should the first call you make for all your cleanroom/critical controlled environment testing and service needs. Contact us online or call 281-859-5999 to discuss your specific needs and to schedule service.