Based on a rapid review performed by the Public Health Agency of Canada and an updated literature search found herein, there is limited evidence of SARS-CoV-2 viral transmission through heating, ventilation, and air conditioning (HVAC) systems.
Schools are encouraged to ensure their HVAC systems are functioning properly in order to further mitigate risk of viral spread via this method.
Recommendations for optimal HVAC system settings are published, but schools should follow local guidelines with the help of HVAC professionals.
Vanstone, J; Asamoah, G; Muhajarine, N; Reeder. B; Dalidowicz, M; Young, C. What role do ventilation systems play in the prevention and spread of COVID-19 and other respiratory diseases in non-clinical buildings? 2020 Sep 4; Document no.: EOC082501 RR. In: COVID-19 Rapid Evidence Reviews [Internet]. SK: SK COVID Evidence Support Team, c2020. 7 p. (CEST rapid review report)