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Woman with severe allergy ‘left with no choice’ but to buy every packet of peanuts on flight
(www.independent.co.uk)
this post was submitted on 08 Aug 2023
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The air within an airplane cabin is recirculated every five or ten minutes. A real severe peanut allergy would be triggered by anyone on the plane eating peanuts.
are planes cleansed that thoroughly between flights? I assume one would have to worry about who was eating what in the area from a previous flight with an allergy that severe
No, they are not.
The majority of airplanes are equipped with HEPA filters. As in, removing 99,97% of particles over 0.3 micron in size. The unfiltered air is fed in from the outside. It's pretty clean and not a consideration for allergens like peanut particles.
Source: https://www.nationalgeographic.com/travel/article/how-clean-is-the-air-on-your-airplane-coronavirus-cvd
HEPA filters remove 99.97% of particles that are 0.3 micron in size. (That is the size of particles they're tested with, as it's the most difficult to filter.) They remove over 99.97% of particles larger or smaller than 0.3 microns.