[roadcat]

Considering that the human can eject bodily fluids almost 20 feet (sneezing, coughing), how does one keep that far away from the infected, sealed inside a metal tube ?

Glad you clarified that statement. Otherwise, 20 feet, huh?

[UCANSEE2]

Yes. I’d say about 20 feet. Any virus ejected from say a sneeze could travel at least 10 feet and then float in the air for another ten feet before coming to rest, where it could ‘survive’ for probably four hours.