Practical answers for hospital ventilation challenges
Many healthcare estates teams are managing ageing plant, maintenance backlog, delayed refurbishments and rooms adapted for new clinical uses, all while meeting ventilation compliance and patient safety standards.
Air Sentry systems can be rapidly deployed with minimal disruption, work alongside or independently of existing HVAC infrastructure and provide cost-effective improvements without the significant capital expenditure or lengthy lead times usually associated with major ventilation upgrades.
Each product solves a specific problem on its own. Together they give estates teams a flexible solution.
See it working: the Aristotle® live demo
Before reading further, try the interactive demo, modelled on a real unit. You can watch CO₂ climb towards 1000ppm, see the alarm trip, and see the fans step up to clear the air, then watch the reading fall back to normal. The demonstration runs on both mobile and desktop, so you can share it with colleagues anywhere.
The range
Air Sentry Wall and Belfast units
The Air Sentry Wall (ASW) and Belfast (ASB) units are the foundation of the range. Both use the same Ultra Clean® cartridge filtration. The ASW is fixed to the wall, out of the way and clear of the floor. The ASB is mobile, for spaces that change use or need cover quickly. Both can go into a ward with little disruption, and either can sit alongside existing ventilation to lift air cleaning performance. They are built to the NETB 2023/01A guidance that sits alongside HTM 03-01, which recognises air cleaning devices in healthcare spaces.
Typical uses include interim cover while plant is failing or awaiting refurbishment, isolation and infectious disease areas, and protective environments for vulnerable patients. They can also pair with the other products on this page, taking their instructions from Aristotle® or working with the pressure units to set up room conditions.
Aristotle® – monitoring, alert and control
Aristotle® is the intelligence layer. It tracks air quality in the room, including carbon dioxide, particulates and nitrous oxide, and can adjust ventilation automatically as conditions change. Aristotle displays real time evidence of room performance. Ventilation fan speeds are responsive to customer defined parameters which may support energy-saving goals.
Shortlisted for the Net Zero Innovation Award, IHEEM Healthcare Estates Awards 2026.
Genesis® – low-level extract
Genesis® provides low level extract without disruptive building work. Available in corner or mid-wall versions. The corner units can optionally provide fresh air supply, HEPA recirculation or pressure control at initial install or retroactively as clinical needs change.
Shortlisted for Product Innovation of the Year, IHEEM Healthcare Estates Awards 2026.
Positive and negative pressure units
Positive and Negative pressure units maintain appropriate airflow to protect vulnerable patients from airborne pathogens and protect others from infective patients.
Wall-mounted and in-ceiling versions are available to suit the room.
Why monitoring and extract matter
NHS buildings are under strain. England’s NHS maintenance backlog has been put at around £17.3bn (25/26), and the National Audit Office estimates that building and infrastructure failures cause roughly 5,400 clinical service incidents every year. Ventilation sits in the middle of that picture. It is hard to see, easy to defer, and critical to patient safety.
Edinburgh’s Royal Hospital for Children and Young People shows what’s at stake. Days before patients were due to move into the new £150m building, independent testing found that critical care ventilation fell short of the required air change rate. The move was called off. The fault was later traced back to an error in a tender document issued years earlier. The hospital finally opened in March 2021, and the delay is believed to have cost almost £17 million. The Scottish Hospitals Inquiry went on to find that the health board had never set out precisely what the ventilation system had to achieve, and had relied on the contractor’s reading of national guidance.
The common thread is simple. Performance has to be defined, measured and checked, not assumed. Air Sentry’s range supports that. Aristotle® gives real time evidence of room conditions and can respond automatically as they change. Genesis® and the pressure units give engineers practical, low-disruption ways to correct a room that isn’t performing, without waiting for a major capital project.
Stronger together
Genesis® can supply the extract, the pressure units can set the pressure regime, and Aristotle® can watch conditions and drive the fans, whether your project is an interim fix for a failing air handling unit, an isolation room or a protective environment. Every product can also be added to existing HVAC rather than replacing it.
Built to last
Air Sentry equipment is UK manufactured, mostly recyclable and designed for a long working life. Service contracts include consumables, travel and annual certification, and Air Sentry operates to ISO 9001 and ISO 14001. That means predictable running costs, a smaller environmental footprint and support that lasts for the life of the equipment.
Talk to us
Tell us about the room, the ward or the compliance problem and we’ll help you find the right combination. Contact Air Sentry at webrequest@airsentry.co.uk or call 01249 721422. 24-hour support is available on 01666 818087.
Please use the contact form to request information, a brochure or to speak to one of our sales team.