Originally Posted by
vikingivesterled
And lets hope the airline have the sense to use more fresh air than existing air in their mix these days. Even though the HEPA filters should do a good job on the reused part.
Both Boeing and airbus advise against turn off the recirc portion of the airconditioning.
Using only fresh air will drastically reduce airflow and increases the chance airborne droplets (with virus) will float further away from the source.
With the recirculation added to the mix, air flow is mostly vertical (coming from the ceiling and exiting via the floor directory below it) keeping the droplets close to the source.
And with a 99%+ capture rate of the filters, you might end up with more clean air in a certain amount of time.