--- title: OHD Quantitative Face Fit Testing Solutions | News | Shawcity description: Discover OHD quantitative face fit testing technology designed to improve respiratory protection and compliance in workplaces. image: https://www.shawcity.co.uk/hubfs/QuantiFit2%20and%20Aerofit%20image%20sept.png --- - [Training](https://www.shawcity.co.uk/training) - [Service & Calibration](https://www.shawcity.co.uk/gas-detector-service-calibration-uk) - [Hire](https://www.shawcity.co.uk/gas-detector-hire-uk) - [Customer Support](https://www.shawcity.co.uk/customer-support) - About Us - [About Shawcity](https://www.shawcity.co.uk/about-shawcity) - [Vacancies](https://www.shawcity.co.uk/shawcity-careers) - Resources - [Events](https://www.shawcity.co.uk/events) - [News](https://www.shawcity.co.uk/news) - [Contact Us](https://www.shawcity.co.uk/contact) [![Shawcity Logo](https://www.shawcity.co.uk/hs-fs/hubfs/Brand%20Logos/NEW%20colour%20logo%2c%2050%20and%20strap.png?height=70&name=NEW%20colour%20logo%2c%2050%20and%20strap.png)](https://www.shawcity.co.uk/) [Login](https://products.shawcity.co.uk/account/login) - Gas Detection - [Portable Gas Detection](https://products.shawcity.co.uk/collections/portable-gas) - [Fixed Gas Detection](https://www.shawcity.co.uk/fixed-gas) - [Ground Gas/ Contaminated Land](https://products.shawcity.co.uk/collections/ground-gas-contaminated-land) - [Calibration Gas](https://products.shawcity.co.uk/collections/calibration-gas) - [Air Quality & Dust](https://products.shawcity.co.uk/collections/air-quality-and-dust) - [Fit Testing](https://products.shawcity.co.uk/collections/fit-testing) - [OEM Gas Sensors](https://products.shawcity.co.uk/collections/oem-gas-sensors) - [Chromium-6](https://products.shawcity.co.uk/collections/chromium-6-detection) - [Drug & Alcohol](https://products.shawcity.co.uk/collections/drugs-alcohol-testing) - [Accessories](https://products.shawcity.co.uk/collections/accessories) [![Shawcity Logo](https://www.shawcity.co.uk/hs-fs/hubfs/Brand%20Logos/NEW%20colour%20logo%2c%2050%20and%20strap.png?height=70&name=NEW%20colour%20logo%2c%2050%20and%20strap.png)](https://www.shawcity.co.uk/) ![](https://cdn.shopify.com/s/files/1/0555/2901/3401/t/2/assets/hamburger-icon.svg) ![](https://cdn.shopify.com/s/files/1/0555/2901/3401/t/2/assets/menu-close.svg) Menu - Products - [Portable Gas Detection](https://products.shawcity.co.uk/collections/portable-gas) - [Fixed Gas Detection](https://products.shawcity.co.uk/collections/fixed-gas-monitoring) - [Ground Gas/Contaminated Land](https://products.shawcity.co.uk/collections/ground-gas-contaminated-land) - [Air Quality & Dust](https://products.shawcity.co.uk/collections/air-quality-and-dust) - [Fit Testing](https://products.shawcity.co.uk/collections/fit-testing) - [OEM Gas Sensors](https://products.shawcity.co.uk/collections/oem-gas-sensors) - [Chromium-6](https://products.shawcity.co.uk/collections/chromium-6-detection) - [Drugs & Alcohol](https://products.shawcity.co.uk/collections/drugs-alcohol-testing) - [Accessories](https://products.shawcity.co.uk/collections/accessories) - [Calibration Gas](https://products.shawcity.co.uk/collections/calibration-gas) - [Training](https://www.shawcity.co.uk/training) - [Service & Calibration](https://www.shawcity.co.uk/gas-detector-service-calibration-uk) - [Hire](https://www.shawcity.co.uk/gas-detector-hire-uk) - [Customer Support](https://www.shawcity.co.uk/customer-support) - About Us - [About Shawcity](https://www.shawcity.co.uk/about-shawcity) - [Vacancies](https://www.shawcity.co.uk/shawcity-careers) - Resources - [Brochure](https://www.shawcity.co.uk/hubfs/Shawcity%20overview%20brochure%20MAR%2025%20web.pdf) - [News & Events](https://www.shawcity.co.uk/news) [CONTACT US](https://www.shawcity.co.uk/contact) ##### [**Guides & Insights**](https://www.shawcity.co.uk/news/tag/guides-insights) # OHD – Quantitative Face Fit Testing for the 21st Century **Shawcity**|29 August 2024 ![OHD – Quantitative Face Fit Testing for the 21st Century ](https://www.shawcity.co.uk/hubfs/QuantiFit2%20and%20Aerofit%20image%20sept.png) Quantitative fit testing comprises two distinct technologies: Controlled Negative Pressure (CNP) and Ambient Particle Counting (APC). Both provide a numerical measure known as a fit factor, assessing how well a respirator seals to the face, unlike qualitative fit testing (typically a bitter or sweet ‘taste test’) which relies on subjective sensory responses to aerosol agents. The new [AeroFit ](https://products.shawcity.co.uk/products/ohd-aerofit-quantitative-cnc-fit-testing-device)face fit test system from OHD has been developed by world-leading![aerofit-new-trans (1)](https://www.shawcity.co.uk/hs-fs/hubfs/aerofit-new-trans%20(1).png?width=322&height=322&name=aerofit-new-trans%20(1).png) 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. Other 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. OHD are the only manufacturer worldwide to offer both types of quantitative fit testing![quantifit2-new-trans (1)](https://www.shawcity.co.uk/hs-fs/hubfs/quantifit2-new-trans%20(1).png?width=346&height=346&name=quantifit2-new-trans%20(1).png) technology. As a pioneer in respirator fit testing, OHD developed the revolutionary and unique CNP quantitative method currently available in their [QuantiFit2](https://products.shawcity.co.uk/products/quantifit-2-respirator-fit-tester) model, which can be used indoors or outdoors. Robust out in the field and quick to set up, it is widely used by responsive teams who value portability and no environmental restrictions, including the FBI and the U.S. Navy. It adheres to HSE protocols (INDG 479) and is suitable for half- and full-face respirators. Both OHD systems are truly portable, using the same battery option (swappable between units) and sharing the same respirator adapters. They also communicate with OHD’s Logic software so that teams can utilise both types of technology side-by-side for easy data management and reporting. Testers can quickly adapt to meet any team’s respirator requirements or individual user preferences. 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 further information on this unique fit testing package, or to arrange a free consultation, product demonstration or site visit, contact the team on: 01367 899419 [solutions@shawcity.co.uk](mailto:solutions@shawcity.co.uk).   ##### Share [Previous post](https://www.shawcity.co.uk/news/chromium-6-risks-detection) [Next post](https://www.shawcity.co.uk/news/shawcity-draeger-partnership) ## **Latest posts** ##### [![](https://www.shawcity.co.uk/hubfs/AI-Generated%20Media/Images/Hydrogen%20Sulphide%20Gas%20Cloud%20Over%20Industrial%20Zone.png) Guides & Insights **Why Smell Cannot Reliably Warn You of H₂S** 25 August 2026](https://www.shawcity.co.uk/news/why-smell-cannot-reliably-warn-of-h2s) ##### [![](https://www.shawcity.co.uk/hubfs/plant-milk-day.png) Blogs **How Is Plant Milk Made? 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