WASHROOMS
Staphylococcus epidermidis bacteria.
structure of its estate, but the same division of labour holds across most private hospital groups too. The first is a straightforward division of labour. Cleaning is managed as an environmental services task, completed by domestic teams, working from a checklist built around what can be physically touched, wiped, or disinfected. Air handling sits under Estates and Facilities as building infrastructure, regardless of whether that estate belongs to an NHS Trust or a private provider. Ventilation grilles, filters, and extractor fans get serviced on their own schedule, monthly, quarterly, annually, which is a world away from the shift-by-shift rhythm of a domestic cleaning round. The second reason is the environmental physics of air; air does not stay clean the way a surface does. Wipe a table at nine o’clock and – until someone touches it – it is still relatively clean at half past. Air offers no grace period. A checklist instruction to “clean the air in Ward 4 at 09:00” would be obsolete the moment someone sneezed at 09:01. Because air contamination is continuous, building management relies on continuous mechanical systems rather than periodic manual intervention. Where specialised HEPA filtration units are deployed under NHS Estates Technical Bulletins, or equivalent internal protocols in private facilities, clinical staff, rather than domestic teams, are tasked with maintaining operational validation. The third reason is the closest the two worlds come to overlapping: dust. Though the risk it carries is more nuanced than ‘clean it and the problem goes away.’ The nearest thing to an ‘air’ item on a cleaning checklist is the instruction to clean high-level surfaces and ventilation grilles because dust can act as a carrier. Most bacteria and viruses that land on dust do not survive there indefinitely; left undisturbed on an uncleaned curtain pole or light fitting, the majority die off naturally over time. Mould spores are a different problem. They can establish and multiply rapidly wherever there is a food source and enough moisture, and vents, extract ducts, and the damp, poorly lit voids around them are ideal. A missed cleaning cycle on a curtain rail is a shrinking risk, a missed cleaning cycle on an extract grille can be a growing problem. Two distinct disciplines, episodic surface cleaning and continuous air ventilation, leave an unmonitored exposure window between them. Infection control leads and clinical scientists are pushing to bridge this operational gap by introducing real-time indoor air quality (IAQ) monitoring dashboards on ward walls. These displays enable clinical managers and cleaning supervisors to monitor air parameters and take corrective action.
92 Health Estate Journal October 2026
Separating evidence from marketing Since the COVID-19 pandemic, the hygiene-tech market has grown fast, and confidence in the marketing has not always kept pace with the science behind it. Products claiming to kill airborne bacteria and viruses are easy to describe but difficult for a non-specialist to interrogate. An estates manager weighing up a purchase can rarely independently verify a kill rate, a reduction percentage or a lab methodology, and that is the position suppliers’ claims are designed to be read in. The way through is asking for the right kind of proof. Independent testing is the dividing line. The government’s Biosafety Investigation Unit at Porton Down provides a benchmark for objective evaluations: standard test organisms are aerosolised into a sealed chamber under controlled conditions, using a scoring protocol independent of manufacturer influence. Testing of this standard against organisms such as Staphylococcus epidermidis yields verifiable performance metrics for procurement teams. For example, a verified trial logging a 98.63 per cent reduction of airborne Staphylococcus epidermidis within 60 minutes, escalating to 99.96 per cent at 120 minutes, provides a clear performance measure over time. That distinction matters. A manufacturer’s in-house data,
however carefully produced, is data the manufacturer had every incentive to favourably present. Third-party testing, with no input into design or scoring, removes that incentive from the equation. Any supplier confident in their product should be able to produce it. If they cannot – or will not – that is worth treating as an answer. It is worth asking what was measured, not just who measured it. A reduction in airborne concentration of a specific organism, recorded over a stated time in a sealed chamber, tells you something concrete and repeatable. A vague claim – ‘kills up to 99.9 per cent of germs’ – with no organism named, no timeframe given, and no indication of who ran the test, tells you little about the product. The two can look identical on a product sheet, but are not equivalent as evidence, and procurement teams are entitled to ask a supplier to show the difference.
A practical framework for evaluations Introducing new engineering controls can create unforeseen maintenance burdens. Estates managers must evaluate operational parameters thoroughly before approving air decontamination systems. First, consider environmental resilience. Estates leads
should evaluate whether high humidity, steam, and airborne dust will cause premature fan motor or sensor failures. The second is to confirm whether the technology actively destroys bioaerosols, or if it masks odours using synthetic fragrances that conceal the underlying microbial load. Infrastructure impact represents another hurdle. Determine whether a unit can run off existing 230V switched spurs, or whether it demands new electrical sub-distribution runs that add upfront cost before the hardware is accounted for. Full lifecycle costing should be established, ensuring continuous energy draws and ongoing filter or bulb replacement schedules are calculated across an entire estate rather than estimated for a single pilot location. Finally, form factor integration dictates long-term management feasibility. Integrating air treatment into assets already required in a washroom – such as hand drying units engineered with internal decontamination chambers – presents an operational advantage over standalone hardware.
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