新风系统当中，目前采用比较多的是物理过滤法，中效过滤网需要定时更换，否则不能达到良好的过滤效果。

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中效过滤网的滤材一般有三种，复合无纺布，进口合成纤维和玻璃纤维。中效过滤器的使用寿命是根据在额定风量使用条件下，3-6个月即需更换过滤器，这样可以有效的保护过滤器的机组也对空气的质量有一个保障。

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中效过滤网主要应用于中央通风系统中级过滤、制药、医院、电子、食品等工业净化中，由于其风量大、阻力小、容尘量高被广泛使用。