VENTILATION Duct


Contaminants


UV Lamps (5)


Disinfected air gets


redistributed


Bacteria Virus Spores


Left, Figure 3: A cut-out view of an operating in-duct UVGI.


Above, Figure 4: Schematic of a UVGI air disinfection installation.


in larger particulates protecting pathogens from the UV light.


Adoption of UV airstream disinfection in Australia Given the familiarity of the healthcare sector with surface and upper air UV disinfection technologies, it follows that this sector has been an early adopter of UV airstream disinfection. Currently only a handful of metropolitan regional hospitals have installed this technology in Australia,


but with the COVID-19 pandemic, and increased awareness of aerosol-facilitated spread of disease, this is likely to change. Meanwhile, specialist healthcare facilities such as assisted reproductive centres are already heavily invested in this technology because of the very stringent air quality standards required to minimise the cytotoxic effects on embryos. While there are many Australian suppliers of surface UV technologies involved in cleaning coils within air-


handling units, very few suppliers offer dedicated UV air disinfection systems, and even fewer have the necessary software to size the units correctly. Many suppliers seek to ‘kill two birds with one stone’ by attempting to install very high-powered UV air disinfection lamps in front of the cooling coils of air-handling units to also disinfect air. This approach can result in very high power usage, and very low pathogen kill-rates, due to the following: n The power requirements for disinfecting


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