Reducing the risk of infectious virus in the indoor air using high efficiency air filtration

A research team comprising scientists from the United States, Canada and Spain recently 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 – the equivalent of 12 viruses for every person in the UK, 25 viruses per person in Canada. The risk of getting an infection through a virus is high as, unlike bacteria, rain cannot wash them away. 

With Covid-19 infecting thousands of people since it was discovered in Wuhan, China in December last year, whole countries have been placed in lockdown in a bid to control the spread of this virus. This latest strain of the disease is particularly threatening because it causes pneumonia but will not respond to antibiotics. However, this virus 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 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 HEPA (high-efficiency particulate air) filters in hospitals, infection control clinics and other healthcare facilities to eliminate microbes and other dangerous particles. 

True high-efficiency particulate air (HEPA) filters are most commonly 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 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 airstream, preventing them from entering or recirculating back into the room. As unfiltered air flows through the HVAC unit’s ductwork, 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 do you need to reduce the risk of viruses in the air? 

Virus containment at health care facilities and biosafety 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, quarantine zones need much higher levels 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 systems 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. 

An air cleaner is recommended for use where the risk of airborne contamination is elevated, for example in crucial high-risk applications such as quarantined zones and laboratories. Both containment units and air cleaners cannot be installed just anywhere as they are specific to the risk and nature of the surroundings, and 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. 

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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 infographics that provides value- based insights in order to combat the virus in the air. Please find them here. 

www.camfil.com

READ NETWORKS EUROPE MAGAZINE

Networks Europe Issue May-June 2020

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