认为通过合理布置末端ffu送风口位置及选择回风形式，以及选用较高级别的末端过滤器，可以在FFU满布率较低时达到较高的洁净度级别。
The result shows that selecting proper location of FFUs, appropriate mode of outlet and high level terminal filter, higher cleanliness level can be obtained in spite of lower coverage rate.
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