CIBSE has published a guide outlining ventilation systems commonly found in buildings so that businesses can prepare to re-open workplaces as the impact of COVID-19 diminishes.
‘COVID-19 Ventilation Guidance Version 4’ (https://bit.ly/3x4tFgd) is designed to help building managers and those who operate and maintain building systems to identify those areas of a building and elements of ventilation systems that may need particular attention to reduce the risks to the building occupants.
The guidance, which will remain under continual review, is intended primarily for offices, educational buildings, retail and industrial buildings where occupants tend to be largely inactive.
It adopts what CIBSE describes as a precautionary approach “with the objective of ventilating spaces as much as reasonably possible with outside air as one measure to reduce transmission risk”.
However, it also considers other methods of protecting people from the effects of COVID-19 by reducing levels of active viral material in spaces where it is difficult to provide good ventilation, including germicidal ultraviolet devices (UV) for air cleaning.
This clever technology uses light in the UV-C spectrum and has been shown to be effective in the battle against coronaviruses. Indeed, according to CIBSE: “There is significant emerging evidence of the efficacy of UV-C sources at a wavelength of 254nm to deactivate SARS-CoV-2.”
UV germicidal irradiation (UVGI) is a well-established technology – it has been an accepted practice since the mid-20th century – using UV-C light to neutralise pathogenic coronaviruses by disrupting the structure of the nucleic acids which form the virus genome.
UV systems take various forms and can include:
- Upper room germicidal UV systems, which may be installed in upper areas of a room, acting on the air above head height and relying on air mixing to enable it to be effective on the whole volume of air in the space over a period of time.
- In-duct UV, which is installed in the air distribution, disinfecting air as it passes through the system.
- Room air cleaner, which passes room air through a combination of filters and UV radiation.
The UVGI filtration systems we supply, for example, can be retrofitted into existing ventilation units to instantly start fighting bacteria and viruses in the airflow and on internal surfaces.
Designed for continuous operation with minimal maintenance, our systems are high efficiency air handling unit and duct mounted UVGI units. Their high output, non-ozonating UV lamps produce high intensity UV- C light at 254nm and boast an operating life of up to 10,000 hours.
Download more information, here: ECEX UV Disinfection for Ventilation Systems.
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