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Article Date: 24th March 2020

Condair - 2019 Novel Coronavirus Outbreak: A Review of the Current Literature & Built Environment Considerations to Reduce Transmission

Condair Novel Coronavirus Outbreak Image

The authors of this study reviewed the substantial research carried out over the last decade into the microbiology of the built environment (BE) and the known information about SARS-CoV-2. The objective was to provide actionable and achievable guidance to BE decision makers, building operators and all indoor occupants attempting to minimise infectious disease transmission.

HVAC operational practises to reduce the spread of SARS-CoV-2

It has been confirmed that SARS can be, and is most often, transmitted through droplets. Considering that SARS-CoV-2 is from a sister clade to the 2002 SARS virus, that is known to transmit from person-to-person, the high incidence of observed person-to-person transmission, and the rapid spread of COVID-19 throughout the world, it is generally accepted at this time that SARS-CoV-2 can also be spread through droplets.

Based upon previous investigation into SARS, spread through aerosolisation remains a potential secondary transmission method, especially within the BE that contain heating, ventilation, and air conditioning (HVAC) units.

1. Higher outside air fractions and higher air exchange rates in buildings may help to dilute the indoor contaminants that are breathed within the BE. Higher outside air fractions may be possible by increasing ventilation damper positions on air-handling units, thus exhausting a higher ratio of indoor air and any airborne viral particles present. For buildings without central HVAC systems, simply opening windows, when outdoor temperatures allow, will increase air exchange.

2. Maintaining an indoor relative humidity between 40%-60% may help to limit the spread and survival of SARS-CoV-2 within the BE. Concurrently it maintains hydrated and intact mucosal barriers of human occupants, resulting in an increase resistance against any microbial attack.

3. Light is another mitigation strategy for controlling the viability of some infectious agents indoors. Building operators should encourage blinds and shades to be opened, to admit abundant daylight and sunlight. Implementing targeted UVGI treatment may be prudent in spaces where individuals that tested positive for COVID-19 were known occupants.

Personal hygiene practises to reduce the spread of SARS-CoV-2

• Proper handwashing is a critical component of controlling the spread of SARS-CoV-2, other coronaviruses, and many respiratory infections

• Individuals should avoid contact and spatial proximity with infected persons

• Properly applied hand sanitiser may be a valuable tool against the spread of SARS-CoV-2 in the BE

• Items should be removed from sink areas to ensure aerosolised water droplets do not carry viral particles onto commonly used items, and countertops around sinks should be cleaned using bleach or an alcohol-based cleaner on a regular basis

Administrators and building operators should post signage about the effectiveness of handwashing for at least 20 seconds with soap and hot water, ensure soap dispensers are full, provide access to alcohol-based hand sanitiser, and implement routine surface cleaning protocols to high touch surfaces where contamination risks are high, such as around sinks and toilets.

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