As the world trade field is expanding, international standard of air filter is urgently needed. At present,China is undergone its revising the national standards, therefore, the development of major air filterstandards between America and Europe is compared here. Diameter distribution of KCl aerosol used inASHRAE52.2 is similar with atmospheric dust, but research for test dust representing actual conditionis still needed. Concepts for electrostatic discharge between Europe and America are different, andclassification upon minimum life efficiency (MLE) is recommended.
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