Table 1.

Case studies of SARS-CoV-2 infections that were facilitated by HVAC systems

Indoor environment	Description	Reference(s)
Restaurant (Guangzhou, China)	Infected clients were in the direction of the air flow from the air conditioner in a space without windows	Lu et al. (2020), Li et al. (2020b)
Hospital No. 1 (Wuhan, China)	SARS-CoV-2 RNA was detected in the air and on various items	Guo et al. (2020)
Hospital No. 2 (Wuhan, China)	35.7% of air outlets tested positive for SARS-CoV-2 RNA	Liu et al. (2020b)
Call center (South Korea)	46% of workers who shared the same office floor tested positive	Park et al. (2020)