Results CTCB-I Cleanroom Testing course May 2025
The Contamination Control Network (CCN) recently held its latest CTCB‑I Cleanroom Testing course in Letchworth from 13 to 15 May 2025.The course welcomed both Associate and Professional level candidates, with Associates attending the first day of training followed by their written exam on day two, while Professional candidates continued through all three days with both written and practical assessments.
By the end of the course, six Professional candidates and two Associate candidates successfully passed, demonstrating strong technical understanding and practical competence.

Successful candidates – May 2025 CTCB-I Cleanroom Testing course
We’d like to congratulate the following candidates:
Professional Accreditation
- Roman Cozacenco
- Nigel Bateson
- Rain Fridolin
- Marika Viisimaa
- Thomas Redfearn (Re-accreditation)
- Mark Jones (Re-accreditation)
Associates
- Chris Davies
- Kurt Foy
The programme covered a range of topics including cleanroom classification, airflow measurement, HEPA filter testing, and microbiological safety cabinet checks.
The Professional CTCB‑I accreditation is valid for five years and applies to the individual, not the company they work for. The Associate accreditation is valid for ten years, providing long-term recognition for those beginning their cleanroom testing careers. You can find a list of all candidates who have attained their accreditation through the CCN on our CCN Register page and also on the CTCB-I register.
CCN continues to support professional development in contamination control by offering accredited training recognised across the sector. For details on upcoming courses and certification pathways, visit the CCN Events page or contact us via our contact form.