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This article discusses the ventilation and filtration in aircraft:

Ventilation rates provide a total change of air 20 to 30 times per hour. Most modern aircraft have recirculation systems, which recycle up to 50% of cabin air. The recirculated air is usually passed through HEPA (high-efficiency particulate air) filters, of the type used in hospital operating theatres and intensive care units, which trap dust particles, bacteria, fungi and viruses.

Does ventilation and filtration in high speed trains typically work the same way, including with similar air renewal intervals, recycling rates, filtration quality?

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    $\begingroup$ Hmm most aircraft ventilation is bleed off from the first compressor stage of the engine afaik $\endgroup$
    – Solar Mike
    Jun 5, 2020 at 7:39
  • $\begingroup$ An airplane has different design requirements. First of all, the airplane system must pressurize the aircraft. This means the energy to bring in air is increase. Second, as @SolarMike says, pulling in the air affects engine efficiency. A train will just need blowers like a car. $\endgroup$
    – Tiger Guy
    Jun 5, 2020 at 13:43

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