单向流风速测试高度为:过滤器下150mm-300mm,详见 ISO-14644-3 B2,2,2 :The airflow velocity should be measured at approximately 150 mm to 300 mm from the filter face or entry plane. 以及 GT/T 25915.3-2010中 B4.2.2 送风风速的描述。
Air speed should be designed, measured and maintained to ensure that appropriate unidirectional air movement provides protection of the product and open components at the working position (e.g. where high-risk operations occur and where product and/or components are exposed).