CADR评级考虑了空气净化器由于重复净化部分空气而降低的效率。
试想：即使HEPA滤网过滤效率为99.99%，若空气净化器引导所有干净的空气循环通过滤网，也并不利于空气净化。
了解更多: CADR和风量的区别»
如果一个净化器有过滤效率为99.99%的HEPA滤网，它的CADR不应该等于风量吗?
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