By theoretical analysis, it defines a new concept-system critical filtration efficiency and puts forward a calculation and selection method of air filters.
通过理论分析，本文首次提出系统临界过滤效率的概念，并从中得出舒适性空调系统空气过滤器的计算和选择方法供参考。
Under stationary filtration condition, firstly the author took the study about the effect of filtration velocity on filtration efficiency. The research shows that there exists a critical velocity.
清洁滤料过滤阶段，就过滤速度对过滤效率的影响进行实验研究，验证了临界过滤速度的存在性。
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