Comparison of existing HVAC operation guidelines for COVID-19 epidemic

 In response to the COVID-19 epidemic and the 2019-nCoV, various institutions and societies have issued relevant guidelines. Reviews the major HVAC-related guidelines and/or documents at home and abroad, including the virus transmission mechanism and HVAC system operation recommendations in the guidelines and/or documents issued by the American Society of Heating Refrigerating and Air-conditioning Engineers (ASHRAE), the Federation of European Heating, Ventilation and Air Conditioning Associations (REHVA), the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan (SHASE), the Architectural Society of China, and the Chinese Association of Refrigeration, as well as the response of the Chartered Institution of Building Services Engineers (CIBSE) and the German Association of Indoor Ventilation Technology (RLT) according to the REHVA guidelines.