What would it take for airline companies to demand that manufacturers install air filtration systems that would remove 95% or better of 0.3 micron particulates, which would include most viruses?
– JRH, Reno, Nevada
The HEPA (high energy particulate arrestance) filters on board commercial jets already perform that level of filtration.
Most airliners recycle 25-30% of the air in the cabin. The air that is being recycled passes thru the HEPA filter and traps particles, including viruses.
The remaining 70%-75% of the air is exhausted overboard. Turnover time for in the cabin for a single-aisle jet like an A320 or B737 is around three minutes.
This means that the exposure possibilities are only from the time the particulate/virus is exhaled until it goes overboard or to the filter. This would be similar to any building where the exhaled particles would be routed into a air return duct then filtered.
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