Camfil advises on air filtration to prevent spread of infectious viruses

Some HEPA filters only trap virus and further measures solution are needed for virucide

A research team comprising scientists from the US, Canada and Spain has revealed that more than 800 million viruses fall on every square metre of the planetary boundary layer (the lowest part of the atmosphere) every day. This is the equivalent of 12 viruses for every person in the UK, 25 viruses per person in Canada.

The risk of getting an infection through virus is high as unlike bacteria rain cannot wash them away.

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. But 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

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

Indeed, many professional engineering organisations recommend HEPA (high-efficiency particulate air) 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 MPPS (most penetrating particle size) 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 micrometre 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.

Upgrading

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.

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 compared 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 Sweden-based 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% or higher category of air filtration.

“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 US (University of Texas at Galveston, Boston University and the Plum Island Animal Disease Center outside New York).” - Anders Sundvik, Vice President Research & Development, Camfil

Educate

In order to educate and create awareness about the 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.

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Camfil (more information, website)