COVID-19 epidemic and central air conditioning systems

2019-nCoV can be transmitted through the air, but whether it will be transmitted through central air conditioning and ventilation system is still uncertain. Thinks that air conditioning airflow in rooms with COVID-19 infection is an important cause of cluster infection. During the epidemic period, the rationality of the operation mode using full fresh air without return air for central air conditioning system is questionable. The central air conditioning system with effective preventive measures can greatly reduce the indoor virus concentration, which should be used. Research and development of effective air purification technology and equipment is an important measure to prevent the spread of epidemic diseases.