Hepa滤网的定义和分级标准

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发表于 2014-10-27 16:06:27 | 只看该作者 |只看大图回帖奖励

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原文链接：http://en.wikipedia.org/wiki/HEPA

HEPA filters, as defined by the DOE standard adopted by most American industries, remove at least 99.97% of airborne particles 0.3 micrometers (μm) in diameter. The filter's minimal resistance to airflow, or pressure drop, is usually specified around 300 Pa at its nominal flow rate.

The specification usually used in the European Union is the European Norm EN 1822:2009. It defines several classes of HEPA filters by their retention at the given most penetrating particle size (MPPS):

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