初效过滤器分为初效板式过滤器、初效折叠过滤器、初效纸框过滤器，初效尼龙网过滤器以及初效袋式过滤器等。

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初效纸框过滤器系列过滤器主要适用于过滤直径为5μm级的颗粒。以国产无纺布，玻璃纤维及合成纤维经特殊混纺制成或进口聚酯纤维为滤材，楔形折叠造型以加大过滤面积，配以高强度硬纸板外框，制成板式结构。均衡的间距及双重加强筋设计确保过滤网的等高褶形，从而过滤器能在阻力小的时候达到大的容尘量。折叠式形状，此外框前后以对角线固定滤材，滤材与外框紧密的粘合防止任何气漏产生，其过滤面积是一般平面的2——5倍。

初效纸框过滤器主要用途应用场所：

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