1. ASHRAE Position Document on Infectious Aerosols Approved by ASHRAE Board of Directors April 14, 2020, American Society of Heating Refrigerating and Air-Conditioning Engineers, Atlanta, GA, USA.
2. REHVA COVID-19 guidance document, April 3, 2020, REHVA, Federation of European Heating, Ventilationand Air Conditioning Association, Brussels, Belgium.
3. AiCARR AiCARR Position Paper on HVAC systems operation during SARS-CoV2-19 emergency. AiCARR, Associazione Italia Condizionamento dell'Aria, Riscaldamento e Refrigerazione, Milano, Italia. Available at: https://www.aicarr.org/Pages/Normative/FOCUS_COVID-19_IT.aspx (accessed July 2020)
4. AiCARR Protocol for risk reduction of SARS-CoV2-19 diffusion with the aid of existing air conditioning and ventilation systems. AiCARR, Associazione ItaliaCondizionamento dell'Aria, Riscaldamento e Refrigerazione, Milano, Italia. Available at: https://www.aicarr.org/Pages/Normative/FOCUS_COVID-19_IT.aspx (accessed July 2020).
5. WMO, Modes of transmission of virus causing COVID-19: implications for IPC precaution recommendations, World Health Organization 2020. WHO reference number: WHO/2019-nCoV/Sci_Brief/Transmission_modes/2020.2.