Shawcity is proud to be the exclusive UK and Ireland partner of OHD, a global leader in respiratory fit testing technology. For over 30 years, OHD has pioneered innovations in quantitative fit testing systems trusted by world-leading organisations across the emergency services, military, medicine, occupational hygiene, mining, and motorsport industries.
As the only manufacturer worldwide to offer both major types of quantitative fit testing technology, Ambient Particle Counting (APC) and Controlled Negative Pressure (CNP), OHD continues to set the standard for accuracy, reliability, and innovation.
Through Shawcity, professionals can now buy or hire OHD’s two flagship systems, AeroFit and QuantiFit2, both engineered to deliver exceptional performance, usability, and value.
AeroFit: Next-Generation Ambient Particle Counting (APC) Fit Testing

The AeroFit system redefines traditional ambient particle counting (APC) technology with a complete redesign focused on modern compliance, speed, and reliability. Built from the ground up, AeroFit represents a new era of quantitative fit testing, efficient, accurate, and simple to use.
Key AeroFit Benefits
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Revolutionary APC Technology
AeroFit’s advanced APC system delivers precise, repeatable, and stable results, offering enhanced accuracy and reliability over legacy particle-counting models. -
Modern, Compact Design
Lightweight and portable, AeroFit is designed for ultimate convenience, allowing effortless setup and use across both fixed and mobile testing environments. -
Quiet and Efficient Operation
Engineered for near-silent performance, AeroFit is ideal for clinical, laboratory, and office environments where low noise levels are essential. -
True Flexibility with Battery Power
Optional battery operation provides complete mobility, enabling testing anywhere, even without mains power. -
Standalone Functionality
Operates independently with no need for a tablet, Bluetooth, or Wi-Fi, giving users greater flexibility and ease of use. -
Seamless System Integration
AeroFit shares the same battery packs, adaptors, and OHD Logic cloud software as the QuantiFit2, simplifying management and reducing operational costs. -
User-Friendly Colour Touchscreen
A clear, intuitive interface enhances operator experience and reduces training time.
QuantiFit2: The Groundbreaking Controlled Negative Pressure (CNP) System

The QuantiFit2 represents the cutting edge of controlled negative pressure (CNP) fit testing, a proven method that eliminates the need for consumables, reduces costs, and supports portable, efficient testing anywhere.
Key QuantiFit2 Benefits
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Zero Consumables, Zero Waste
OHD’s unique CNP technology requires no particle generation or consumables, significantly lowering running costs and environmental impact. -
Test Anywhere – Indoors or Outdoors
Purpose-built for maximum versatility, QuantiFit2 can perform accurate fit testing both indoors and outdoors, perfect for remote or mobile operations. -
Ultra-Fast, Highly Accurate Testing
Complete fit tests in under three minutes with exceptional accuracy and repeatability, maximising productivity across teams and sites. -
Advanced Colour Touchscreen Interface
The large, intuitive display simplifies setup, operation, and data management, making fit testing faster and more user-friendly. -
Shared Components for Total Compatibility
QuantiFit2 shares the same batteries, adaptors, and Logic cloud platform as AeroFit, offering convenience and consistency across devices. -
Fully Portable and Low Maintenance
Compact, battery-powered, and free from consumable parts, QuantiFit2 is designed for effortless transport and minimal upkeep.
Buy or Hire from Shawcity – Your Partner for Respiratory Fit Testing Excellence
Whether you’re looking to invest in a permanent solution or require short-term hire, Shawcity offers both AeroFit and QuantiFit2 systems to buy or rent. As the exclusive OHD distributor for the UK and Ireland, Shawcity provides expert advice, full technical support, and free product demonstrations to help you find the right system for your organisation.
Looking to upgrade your existing equipment?
If you currently use an older APC fit testing unit, from any manufacturer, contact us for a quote. Our team can help you trade in your old system and transition to the latest OHD technology with AeroFit or QuantiFit2.
Both AeroFit and QuantiFit2 share:
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Optional battery power for total mobility
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Silent operation for user comfort
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Bright colour touchscreens for intuitive operation
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Shared Logic cloud software for seamless data management
Book Your FREE Demonstration Today
Experience the next generation of quantitative fit testing with AeroFit and QuantiFit2 from Shawcity. Discover how OHD’s world-leading technology can transform your respiratory protection programme with faster, cleaner, and more accurate results.
📞 Call us on 01367 899553
💻solutions@shawcity.co.uk