7 ms·
When I read a long time ago I interpreted recirculated air to mean 100%. It seems that old planes had 100% fresh air and modern planes are 50% or so recirculate
by devonkim 6y ago
When I read a long time ago I interpreted recirculated air to mean 100%. It seems that old planes had 100% fresh air and modern planes are 50% or so recirculated. Heck, I didn't think even HEPA filters would have been sufficient until I just did some reading, but clearly if as of 2002 a simple cold virus won't transmit appreciably with recirculation, the coronavirus won't either [1].
[1] https://jamanetwork.com/journals/jama/fullarticle/195131 https://jamanetwork.com/journals/jama/fullarticle/195131
- m0zg 6y agoThe problem with recirculation is not that it makes through the filter (although that'd be part of the issue, if it did), the problem is that air is blown throughout the cabin, and those droplets travel quite a bit _before_ they reach the filter. Someone sneezes 3-4 rows away from you, and you could inhale whatever they expelled.