@diy_masks @eswillwalker @JimRosenthal4 Maybe, but the commercial pre-fiters are more like nylon mesh which makes them very easy to clean (either vacuum or quick rinse) and close to zero pressure drop when clean. I don't think you really gain much from anything that's actually filtering.
@diy_masks @eswillwalker @JimRosenthal4 也许吧，但商业预装配器更像尼龙网，这使得它们非常容易清洁（真空或快速冲洗）并且在清洁时压降接近零。我不认为你真的从任何实际过滤的东西中获得太多收益。