1/ A follow-up on gyms. A couple of months ago I modeled the volume of particles deposited in the respiratory system of those infected in an outbreak in Restaurant X in Guangzhou China with assumed infector emission profiles. More ...
2/ I then placed the infector from Restaurant X in different scenarios w/ ratio of volume deposited in new scenario to that of restaurant X. That ratio (omega) for a specific gym is shown in figure here. The vertical axis is omega for several ventilation/control scenarios.
3/ In this analysis, infector X is a staff member in the gym emitting aerosols that are well mixed into the gym. The receptor did 75 minutes of aerobic exercise w/ a heavy breathing rate (greater inhalation dose than if not doing aerobic exercise).
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4/ The under-ventilated gym yields a situation worse than Restaurant X. Even w/ ventilation at ASHRAE 62.1 the volume (deposited) dose is higher than those infected in Guangzhou. Even w/ greater ventilation & controls the ratio is pretty high.
5/ Of course, the more people in the gym and higher the local infection rate the higher the probability that someone in the gym is infected. This analysis did not include an infector doing aerobics, too, which would have led to an even worse condition.
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