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Reducing risk of viruses using high efficiency air filtration

A research team comprising of scientists from the United States, Canada and Spain reveals that more than 800 million viruses fall on every square metre of the planetary boundary layer (the lowest part of the atmosphere) every day. The risk of getting an infection through virus is high as, unlike bacteria, rain cannot wash them away.

Anders Sundvik, vice president of research and development for Camfil.

A potentially devastating new disease has infected thousands of people since it was discovered in Wuhan, China in December last year. Chinese cities have been placed in lock-down in a bid to control the spread of the virus. This latest strain of the disease is particularly threatening because it causes pneumonia but will not respond to antibiotics. However, coronavirus (COVID-19) is by no means the only threat to human health.

This, of course, begs an important question – what can you do to protect yourself from these infections (not to mention other biological contaminants that pose health risks for building occupants such as smoke, mite, bacteria, house dust and pollen)?

Unlike with many other risks, we have no choice about breathing. However, while most of us don’t have the power to make the air cleaner, there are some things individuals can do to reduce the effect of these infectious particulates in the air.

HEPA filters can reduce the impact of the virus from the air

HEPA filters have been proven over decades across a wide range of healthcare facilities and life sciences applications, controlling the spread of airborne particles and organisms such as viruses and bacteria.

Indeed, many professional engineering organisations recommend high-efficiency particulate air (HEPA) filters in hospitals, infection control clinics and other healthcare facilities to eliminate microbes and other dangerous particles.

True HEPA filters most commonly are rated by test methods that begin with a minimum capture efficiency. The efficiency of HEPA filters is measured at most penetrating particle size (MPPS), that means this is the lowest efficiency of the filter. For smaller or larger particles that filter will perform even better. MPPS is typically between 0,1-0,25 micrometer in size. Bacteria and viruses are often smaller than that but typically attach themselves to larger particles. It’s also important to understand HEPA filters do not actively kill living organisms. They capture and hold them within the matrix of the filter.

High efficiency air filters can be installed in HVAC systems, filtering out biological pollutants and particulate matter carried by the air-stream, preventing them from entering or recirculating back into the room. As unfiltered air flows through the HVAC unit’s duct-work, the air filter captures and holds the airborne pollutants.

For further risk mitigation of airborne pathogens, it is recommended to upgrade or install the highest possible efficiency HEPA filtration (H13 or higher) in the existing ventilation system. This will improve your chances to avail an extra layer of protection against airborne pathogens.

What kind of solutions you need to reduce the risk of virus in the air?

Virus containment at health care facilities and bio-safety labs is very much about control measures and precautions for airborne exposure. Measures include ventilation, pressure differentials, exhaust ventilation, air filtration and cleaning, ultraviolet and germicidal irradiation (UVGI) and even temperature and humidity control.

Air filtration solutions depend on the category of the risk when in application. High density areas with most affected surroundings such as laboratories, containment units, quarantined zones need much higher level of protection compare to low risk exposure surroundings or controlled areas like homes or small business space. High risk application needs air containment and filtration equipment of HEPA Class H13 or higher along with use of special personnel equipment and clothing, as well as a segregated air supply, among other precautions.

Consider using air cleaners for fast and easy retrofit in case of sub-standard ventilation system for improvement in air filtration.It is also a way to rapidly boost the air quality of an already good functioning system when there is an increased risk that demands even better protection.

For crucial high-risk applications, such as quarantined zones and laboratories, Camfil provides compelling containment equipment. However, an air cleaner is recommended for use where the risk of airborne contamination is elevated. Both containment units and air cleaners cannot be installed anywhere as they are specific to the risk and nature of the surroundings, but an air cleaner can never replace a full containment set where there is a need.On the other hand, low risk applications can consider using EPA filters or ePM1 80 per cent or higher category of air filtration.

Anders Sundvik, vice president of research and development, Camfil, said: “There are more than 60 bio-safety laboratories classified as Level 4 (highest risk) by international commission in the world. Camfil has already delivered containment solutions for many of them in China (WUHAN), France (INSERM, CEBIO and IRBA), Switzerland (SPIEZ), Germany (Hospital Charite, Berlin Airport) and the U.S. (University of Texas at Galveston, Boston University and the Plum Island Animal Disease Center outside New York).”

In order to educate and create awareness about role of air filtration and containment of airborne infections in order to reduce the risk indoors, Camfil has created a series of education based info-graphics that provides value-based insights in order to combat the virus in the air. Camfil’s clean air solutions helps to reduce the potential spread of diseases through the air handling systems of bio-safety labs and hospitals.

27 February 2020


hillary spicer
19 March 2020 09:48:20

I presented to CIBSE / ASHRAE group entitled "Preventing the spread of Airborne Pathogens in Enclosed Environments" downloadable at

P Skeet
19 March 2020 09:05:45

There is also ultra violet irradiation, which has been around for about 30 yrs, and is known to kill viruses, but few take up. Perhaps they will now. Try Googling that, or 'uvc sterilisation'

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Whitepaper tackles legionella risk

Low occupancy rates in commercial buildings could be leading to a ticking time bomb of water quality issues according to Guardian Water Treatment.

To help building owners take the right steps to prevent these issues, in particular legionella, the company has launched a new whitepaper – Locked down but not forgotten.

In the whitepaper, Guardian draws on its own data from over 30,000 samples taken from commercial buildings, predominantly in London, over a six-month period starting from April 2020 (when the first lockdown began).


IAQ infographic

Mitsubishi Electric has released an infographic on the importance of indoor air quality....


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