I’m not sure using the room volume is correct here, since all things being equal I would expect doubling the volume of the room while keeping filtration capacity and occupancy constant to be safer, but this would say it’s less safe?
If I imagine a large gymnasium, with a woefully underpowered air filter on one side and a handful of people on the other, then the CFM/person model breaks down. But I don’t think the microcovid model is based on consideration of corner cases like this.
The microcovid model isn’t CFM/person, it is CFM/CF. That is, it says you need to have sufficient purification capacity to filter the volume of the room five times per hour. See above for details on the measurements in the study (27x20 room with a 12ft ceiling).
If I imagine a large gymnasium, with a woefully underpowered air filter on one side and a handful of people on the other, then the CFM/person model breaks down. But I don’t think the microcovid model is based on consideration of corner cases like this.
The microcovid model isn’t CFM/person, it is CFM/CF. That is, it says you need to have sufficient purification capacity to filter the volume of the room five times per hour. See above for details on the measurements in the study (27x20 room with a 12ft ceiling).