I work in operating theatres. Some of our rooms are 4 metres high, 8 metres wide and long. 256 square metres of air. And our HAVC fans work so hard that most of the air is swapped every 2 minutes, and, every single molecule of air is exchanged every 6 minutes.
We still wear masks, we still stay away from the surgical field, and if we have an infectious patient, everyone in the room will wear a full gown and mask, not just the doctors and nurses scrubbed in.
Exchange systems mitigate risk, by reducing “dwell time” of droplet and airborne disease. But they can’t stop immediate proximity transmission. They’re not wind-tunnel-air-speeds blowing everything away immediately.
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