3. What is allowed as a percentage of air re-circulated?
The percentage of re-circulated air that is allowed is dependent on national occupational and safety legislation. A certain amount of fresh air has to be supplied to production and control areas and this is normally in the range of 10 to 20%.
关于循环风的比例是根据national occupational and safety legislation如何理解？？？如何计算？？是否有相应的实例？非常感谢！@石头968
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发表于 2016-8-31 18:31:34
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