过滤精度指设备允许通过固体颗粒的较大粒径。过滤精度由设备要求决定，如燃气轮机压缩机燃料气系统要求的过滤精度为5μm。
在现实应用中，我们要根据需要过滤固体介质颗粒大小，选择合适的过滤精度。当我们对滤网和滤芯无特殊要求时，滤芯精度一般选用30目。在工程实际中，对于液体介质滤芯精度选用60目，气体介质滤网选用120目，基本能满足过滤精度要求。值得注意的是，单纯的目数并不能表示过滤精度，还需取决于滤网的线径。
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