How Indoor Air Systems Can Spread Cov-19

This is a conceptual visualization of how SARS-CoV-2 might disperse throughout a room by a recirculating fan. It assumes there is an aerosolization event that emits viral droplets (in red) aerosols (yellow) and fine aerosols (in blue). These get caught up in the air flow. This assumes dry indoor air, no filtration, and minimal outside air. You can see that the hypothetical attack rate in this scenario is high, by the number of occupants that become infected (noted with red profiles).

This is a conceptual visualization of how SARS-CoV-2 might be reduced in a room with a window and exhaust fan. It assumes there is an aerosolization event that emits viral droplets (in red) aerosols (yellow) and fine aerosols (in blue). These get caught up and removed by abundant airflow passing from the window to the exhaust fan. This assumes 50% relative humidity. You can see that the hypothetical attack rate in this scenario is relatively low.