One of the safest places to have in person discussions is the firing line at my local indoor shooting range. The ventilation arrives behind the firing line and is removed at the far end. Any human aerosols and smoke from firing a firearm goes directly down range. The next best place is inside a raised floor computer room. Positive pressure under the floor, exit air up with the heat flow. The objective is to not be breathing other people's air.
There is fecal aerosol transmission.