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Improved ventilation essential to safe use of buildings and public spaces, say leading engineers

Open-access content Tuesday 20th July 2021 — updated 9.51am, Wednesday 21st July 2021
Authors
Herpreet Kaur Grewal
web_london-underground-CREDIT-surachetsh_iStock-1251111638.png

The report highlights the responsibilities of those who manage buildings or transport – Surachetsh-iStock

Good ventilation inside public buildings and on transport systems is essential to reduce the risk of Covid-19 and other infections, according to a report published by the Royal Academy of Engineering and the National Engineering Policy Centre (NEPC).

In the report, commissioned by the government’s chief scientific adviser, Sir Patrick Vallance, leading engineers say the importance of ventilation is too often neglected, and that the Covid-19 crisis has revealed flaws in the way we design, manage and operate buildings. Unless these are addressed, they could disrupt management of this and future pandemics, impose high financial and health costs on society and constrain our ability to address other challenges such as climate change.

Clear, consistent communication and advice on ventilation from government and professional bodies are needed to help building owners and operators manage infection risks, states the report. Clearly identifiable measures that can be implemented at a moderate cost will help to ensure that adequate ventilation is prioritised alongside more visible measures such as surface cleaning and distancing.

The study also warns that there is an urgent need to plug skills and knowledge gaps and put in place the training, reskilling and recruitment needed to fill them. Even in sectors such as hospitals, which have a clear regulatory framework and an explicit remit for managing the health and safety of vulnerable populations, levels of skill and competence vary.

In a series of evidentiary hearings, the Royal Academy of Engineering uncovered differing levels of organisational maturity across operators and sectors, and variation in the ability and motivation of owners to understand, manage and govern issues of infection control.

Investment in research and development is needed to clarify issues such as acceptable minimum standards for ventilation to support regulation by Local Authorities and others. Efforts to increase resilience to infection must also work alongside the delivery of significant carbon emission savings from our buildings. These two ambitions should be driven forward in tandem and efforts across government need to be fully coordinated.

The report warns that technological solutions are not a ‘silver bullet’, and uninformed reliance on technology can even have negative consequences. For example, air cleaning using high-efficiency particulate air (HEPA) filters or ultraviolet light (UVC) can be effective in reducing infection risks in locations where good ventilation is difficult to achieve. 

However, the benefits of using other kinds of air cleaning devices, often heavily marketed, are less clear.

Key recommendations in the report include:

  1. Government should urgently map the knowledge and skills requirements across the building industry, general businesses, and the engineering professions and put in place plans to address the skills gaps identified.
  2. Government should undertake a rapid review of the capacity and capability requirements among regulators (including local authorities) to support and enforce standards in maintaining buildings for public health.
  3. Working with the National Core Studies Programme, UKRI and the National Academies, the government should put in place an action plan to address key research gaps on an accelerated basis.
  4. Research and demonstration projects should be commissioned to fill key knowledge gaps such as the acceptable minimum standards for ventilation to manage infection risk and to underwrite regulation and enforcement.
  5. Action to meet Net Zero must be developed in a way that is consistent with priorities around indoor air quality and making buildings resilient to infection.

Professor Peter Guthrie OBE FREng, Vice President of the Royal Academy of Engineering and chair of the NEPC infection resilient environments working group, said: “Buildings make an enormous difference to people's health and we have often neglected this in the past, which is bad news in a pandemic because they are one of the most significant levers that we have to control infection. We must take action now to make sure that good practice in ventilation is widely understood and applied across workplaces and public buildings.

“Longer term, this is a real opportunity to transform the way we design and manage our buildings to create good, healthy and sustainable environments for those who use them. We must also integrate this thinking on infection control into our approach to net zero, to prevent inadvertently hard-wiring a susceptibility to infection and other health risks into our building stock and management practices.”

Dr Hywel Davies CChem CSci, technical director at the Chartered Institution of Building Services Engineers, said: “Clear communication on ventilation is essential – we need to support owners and operators with clear and simple guidance, emphasising the importance of improving ventilation while maintaining wider good practice on infection control.

“Our aim should be to enable everyone who has responsibility for managing buildings or transport to understand how to respond in a practical and timely manner, and to establish an appropriate balance of measures to manage infection risks alongside thermal comfort, air quality and energy concerns.”

Image credit | Surachetsh-iStock
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