Fit testing systems that are changing the industry

The alternative method is qualitative testing, which relies on a user’s sensory detection of bitter or sweet agents, quantitative methods eliminate subjectivity and deliver precise results.

Testing is essential in ensuring that respiratory protective equipment (RPE) fits correctly and offers the intended level of protection.

Two leading technologies: CNP and APC

Quantitative testing uses two main technologies:

• Controlled Negative Pressure (CNP): This method evaluates mask fit by measuring air leakage into a respirator under a vacuum.
• Ambient Particle Counting (APC): This approach measures the concentration of particles inside and outside the mask in real time.

Both technologies deliver accurate, numerical results, ensuring workers are properly protected in high-risk environments.

AeroFit: A next-generation APC System

The new AeroFit face fit test system from OHD has been developed by world-leading industry experts to redesign APC fit testing from the ground up and bring the technology into the 21st century.

AeroFit does not require a tablet or Bluetooth to be able to perform fit tests. Improvements include quicker set-up, automated daily verification, searchable respirator lists, improved workflows and quieter operation. The unit can test all respirator types in a controlled environment with the particle counting method.

QuantiFit2: CNP for maximum flexibility

The QuantiFit2 takes portability and accuracy to new heights. Using OHD’s patented CNP technology, it delivers fast, reliable testing with no dependency on ambient conditions or consumables. Rugged and field-ready, it's used by elite organisations like the FBI and U.S. Navy. It complies with HSE INDG 479 and is suitable for both half- and full-face respirators.

Seamless integration, total portability

Both systems are fully portable, sharing batteries and respirator adapters. They also integrate with OHD’s Logic software for efficient data management, streamlined reporting, and simplified testing across teams. Whether you need indoor control or field flexibility, the AeroFit and QuantiFit2 work in harmony to meet all respiratory testing demands.

Exclusively from shawcity

Shawcity is the only fit-testing instrument supplier to offer both APC and CNP technologies in the UK and Ireland with AeroFit and QuantiFit2. Each unit is available to purchase or hire and can be fully serviced and maintained in the UK, eliminating the time delays traditionally associated with having to send units back to the U.S.A. manufacturer.

For more information, visit www.shawcity.co.uk