Life Sciences
4 min read

Agidens validates cleanroom facilities of pharmaceutical multinational


Agidens conducted an extensive validation of the cleanroom facilities of a pharmaceutical multinational in Ghent. The facilities cover a total area of 2589.81 m², divided into grade C and B. During the project, 639 particle counts and 191 recovery tests were carried out.

The validation was fully digitally documented in the customer’s systems, making the progress transparent and traceable. Additionally, Agidens also completed 130 maintenance orders, which were carefully monitored and completed.

Efficient planning and good communication between Agidens and the customer enabled the validation to be completed in just 9 working days, faster than expected and planned.

particle counts
recovery tests

Particle counts

When performing particle counts in cleanrooms, we follow a structured step-by-step plan. We move from location to location to verify that the particle count meets ISO requirements for each zone.

For a grade C zone, the concentration may not exceed 352,000 particles of 0.5 µm per m³ of air and for particles of 5.0 µm, it may not be more than 2,900 particles per m³. In a grade B zone, the standards are stricter: here the concentration may not exceed 3,520 particles of 0.5 µm per m³ and for particles of 5.0 µm, this is limited to a maximum of 29 particles per m³.

During these tests, we use multiple particle counters simultaneously in each room. After the measurements are completed, the results are stored according to Good Documentation Practice (GDP) in a central online system.



Recovery tests

Recovery tests in cleanrooms are intended to check whether the air circulation is sufficient to efficiently remove particles. These particles can arise from various sources, such as people and materials.

During these tests, we introduce smoke near the particle counter and carefully monitor how the particle count changes over time. The results are then compared to the requirements of the ISO standards.

For class B and C zones, there must be a reduction of respectively 100 times and 10 times in the number of particles within a maximum of 20 minutes.




By choosing Agidens, customers ensure a partner that not only has the necessary expertise but also truly understands what is required to successfully handle a validation project. This makes us a reliable choice for companies looking for cleanroom validation services.


“The collaboration with our customer went smoothly. It was clearly agreed in advance who was responsible for which tasks and to whom it had to be reported. Every day we held a 15-minute status meeting, discussing which rooms we would test the next day, where problems had occurred, and how we could address them. This approach helped us prevent potential overlaps and nip problems in the bud.”


Testing & Inspection Consultant
“Thanks to thorough planning and preparation, we did not face any major problems during the validation phase. We were able to schedule measurements efficiently and carry them out without significant obstacles. A key element of this smooth execution was making clear agreements with internal staff. A specific example of this is the execution of recovery tests, which required the temporary disabling of the fire alarm. This required precise communication with the fire watch to ensure everything went safely.”


Testing & Inspection Consultant
“A typical day looks like this: we start by discussing the tasks for the day, followed by dressing up to enter the cleanrooms. Then we begin with the zero counts of the particle counters and the setting up of the electronic systems for validation. The materials are also distributed among the team members. After that, we get to work.”


Testing & Inspection Consultant

“We would like to thank everyone at Agidens for their flexibility during the execution and documentation. We are extremely satisfied with the approach and quality of the work delivered. Meanwhile, we have received the good news that the cleanroom certification report has been fully approved. This is an important milestone as we can now proceed to the Environmental Monitoring Performance Qualification (EMPQ).”

QA Qualification Engineer


Our expertise and customer-oriented approach enable us not only to meet the requirements but also to proactively think along. This results in customized solutions that increase efficiency.

Curious about our comprehensive validation approach? We would be happy to explain it to you.

Ellen Van Der Plas - Agidens

Related projects

Thermal mapping & qualification of HVAC systems in warehouse at 3PL provider

More information

Sterilization validation project at Datwyler

More information

From A to Z Validation at FertiPro

More information