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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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|小黑屋|手机版|Archiver|三苹果 3PingGuo
发表于 2014-10-27 16:06:27
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