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Biological Safety Cabinets For Biomedicine Sep 19, 2017 Particles larger than 0.3 microns are mainly used as inertial motions, and the higher the particle efficiency. Particles are most difficult to filter out by diffusion and inertia. When measuring the performance of high-performance filters, it is often stipulated that the most difficult to measure the dust efficiency value. The impact of air conditioning filter resistance is the wind speed, the greater the resistance of the filter, the second is the pollution of dust, pollution, the greater the resistance. In the case of constant wind speed, wind resistance basically reflects the number of dust collector.