HEPA Filter Testing (ISO 14644-3 Photometry)

Location: Letchworth Garden City, UK
Feb. 20 | July 17 | Sept. 11 | Oct. 29 | Oct. 31

There is a requirement in all clean air and containment industries to test the HEPA filter systems that protect people, products, and the environment.

ISO 14644-3 describes the installed filter leakage test, commonly referred to as the DOP (Dispersed Oil Particle) test. Being the preferred method in all industries except microelectronics, this test is global, and while it appears simple, in fact it can be quite complex.

ATI delivers a 1-day course on testing installed HEPA filters, using trainers who are very experienced in this industry, the most current equipment, and the latest best practices.

The morning of theory will provide delegates with knowledge on what to test, what to test it with, when to test it, and how to test it. The afternoon is reserved for practical work and gives delegates confidence to set up test equipment, connect to an installed HEPA filter system, carry out a test, and detect the leaks we created in test filters. The afternoon ends with a written examination.

Who should attend?
Attendance is advised for anyone in the clean air and containment industry who has a role in engineering, testing, quality assurance, validation, operations, management, inspections, or anyone responsible for the performance of clean air facilities and equipment.

Our courses also prepare delegates for CTCB-I certification. CTCB-I Testing and CTCB-I Technology courses are hosted and endorsed by the Contamination Control Network (CCN). Visit www.theccnetwork.org for more information.

What people say
We have received a 100% satisfaction rating on post-training surveys. A recent delegate said,

“Great investment and well worth the money paid to undertake the training. A big thank you to Tim and Theresa, you did ATI proud.”

Class size

  • The course is designed for up to 14 delegates in ATI training rooms
  • Larger numbers of delegates can be trained at customer sites. Send an email to salesuk@atitest.com for more information or use the Contact Us Now form below.
  • Online courses are scheduled throughout the year for delegates who are unable to travel.

ATI has a custom-made facility complete with a training room and lab with various test set ups and instruments to ensure delegates receive a true hands-on experience. The facility is conveniently located near several hotels and shops and is accessible to nearby airports and trains. Lunch is provided at each training session.

Training materials and certificates
A course manual is provided, and a certificate is awarded for successful completion of the course and exam.


  • Luton Airport – Luton Airport is only 12 miles away. We recommend using the local taxi service from the airport.
  • Eurocabs – Eurocabs is based in Letchworth and they are the preferred taxi service. The fare from the airport to our facility is approximately £45 plus parking costs for up to four passengers. Cash only. + 44 (0)1462 600700
  • Hackney Carriage – Licensed Hackney Carriages are available from the rank outside the terminal. Please ask for pricing before you start your journey.
  • Car Hire – Car hire is available at all airports. Below is a list of the most common companies:

Free on-site parking is available at our facility.

All hotels are located conveniently within 1.2 miles of our training facility. The closest hotel is the Travelodge.

Travelodge Letchworth
Garden City

The Broadway Hotel

Premier Inn Letchworth
Garden City Hotel

Mercure Letchworth Hall



  Contact Us Now