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Why cabin HEPA filters work

机译：为什么机舱HEPA过滤器工作

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According to IATA, the risk of infection on airplanes is probably lower than in many confined spaces because modern airplanes have cabin air filtration systems equipped with high efficiency particulate air (HEPA) filters. HEPA filters have similar performance to those used to keep the air clean in hospital operating rooms and industrial clean rooms. These filters are very effective at trapping microscopic particles as small as bacteria and viruses. HEPA filters are effective at capturing greater than 99% of the airborne microbes in the filtered air. Filtered, recirculated air provides higher cabin humidity levels and lower particulate levels than 100% outside air systems. The cabin air system is designed to operate most efficiently by delivering approximately 50% outside air and 50% filtered, recirculated air. This normally provides 15 to 20 cubic feet of total air supply per minute per person in economy class. The total air supply is essentially sterile and particle-free. Cabin air circulation is continuous. Air is always flowing in and out of the cabin. Total airflow to the cabin is supplied at a bulk flow rate equivalent to 20 to 30 air changes per hour. This provides temperature control and minimizes temperature gradients within the cabin.
机译：据国际航空运输协会，感染对飞机的风险可能比许多狭窄的空间更低，因为现代飞机有配备高效微粒空气（HEPA）过滤器室内空气过滤系统。 HEPA过滤器具有相似的性能与用于保持空气清洁医院手术室，工业洁净室。这些过滤器是在捕捉微观粒子小到细菌和病毒是非常有效的。 HEPA过滤器在过滤的空气捕获空气传播的微生物的大于99％的有效。过滤，再循环空气提供了更高的车厢湿度水平和颗粒物水平小于100％的外部空气系统低。机舱空气系统被设计为通过提供约50％的外部空气和50％的过滤，再循环空气最有效地运行。这通常提供15至20立方英尺每分钟每人经济舱总空气供应的。总空气供应基本上是无菌的和无颗粒的。客舱的空气流通是连续的。空气总是流入和流出机舱。总气流到车厢在主体流动速率相当于每小时20至30的空气的变化被供给。这提供了车厢内的温度控制和最小化的温度梯度。

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