过滤材料
既有效地拦截尘埃粒子，又不对气流形成过大的阻力。杂乱交织的纤维形成对粒子的无数道屏障，纤维间宽阔的空间允许气流顺利通过。
效率
“过滤器”捕集粉尘的量与未过滤空气中的“粉尘量”之比为“过滤效率”。小于0.1m（微米）的粒子主要作扩散运动，粒子越小，效率越高；大于0.5m的粒子主要作惯性运动，粒子越大，效率越高。
阻力
纤维使气流绕行，产生微小阻力。无数纤维的阻力之和就是过滤器的阻力。
“过滤器阻力”随气流量增加而提高，通过增大过滤材料面积，可以降低穿过滤料的相对风速，减小过滤器阻力。
动态性能
被捕捉的粉尘对气流产生附加阻力，于是，使用中过滤器的阻力逐渐增加。被捕捉到的粉尘形成新的障碍物，于是，过滤效率略有改善。
被捕捉的粉尘大都聚集在过滤材料的迎风面上。滤料面积越大，能容纳的粉尘越多，过滤器寿命越长。
使用寿命
滤料上积尘越多，阻力越大。当阻力大到设计所不允许的程度时，过滤器的寿命就结束。有时，过大的阻力会使过滤器上已捕捉到的灰尘飞散，出现这种二次污染时，过滤器也该报废。
静电
若过滤材料带静电或粉尘带静电，过滤效果可以明显改善。因静电使粉尘改变运动轨迹并撞向障碍物，静电力参与粘住的工作。
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