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根據(jù)所需的清潔度、待去除顆粒的數(shù)量和大小以及可接受的維護(hù)要求選擇過濾器。高效微粒空氣（HEPA）機(jī)械過濾器（圖16）不會釋放收集的微粒，因此可用于潔凈室和釋放有毒微粒的區(qū)域。HEPA過濾器顯著增加系統(tǒng)壓降，在選擇風(fēng)機(jī)時必須考慮這一點。圖17顯示了其他機(jī)械過濾器。C2713單元折疊紙氣流圖16。HEPA過濾器。折疊濾袋過濾器圖17。機(jī)械過濾器。其他類型的機(jī)械過濾器包括過濾器、粘性涂層過濾器和擴(kuò)散過濾器。過濾可去除比金屬過濾器網(wǎng)格中的空間大的顆粒，通常用作靜電過濾器的預(yù)過濾器。在粘性涂層過濾器中，通過過濾器纖維的顆粒與纖維發(fā)生碰撞，并停留在纖維表面。擴(kuò)散利用氣流中存在的湍流將微粒驅(qū)動到過濾器表面的纖維上，從而去除細(xì)顆粒。靜電過濾器（圖18）提供較低的壓降，但通常需要一個機(jī)械預(yù)過濾器來收集大顆粒，并需要一個機(jī)械后過濾器來收集可能從靜電過濾器上吹出的團(tuán)聚顆粒。靜電過濾器使通過電離場的粒子帶電，并將帶電粒子收集在帶有相反電荷的平板上。這些板可以涂上粘合劑。

Filters are selected according to the degree of cleanliness required, the amount and size of particles to be removed, and acceptable maintenance requirements. High-efficiency particulate air (HEPA) mechanical filters (Fig. 16) do not release the collected particles and therefore can be used for clean rooms and areas where toxic particles are released. HEPA filters significantly increase system pressure drop, which must be considered when selecting the fan. Figure 17 shows other mechanical filters. C2713 CELL PLEATED PAPER AIR FLOW Fig. 16. HEPA Filter. PLEATED FILTER BAG FILTER Fig. 17. Mechanical Filters. Other types of mechanical filters include strainers, viscous coated filters, and diffusion filters. Straining removes particles that are larger than the spaces in the mesh of a metal filter and are often used as prefilters for electrostatic filters. In viscous coated filters, the particles passing through the filter fibers collide with the fibers and are held on the fiber surface. Diffusion removes fine particles by using the turbulence present in the air stream to drive particles to the fibers of the filter surface. An electrostatic filter (Fig. 18) provides a low pressure drop but often requires a mechanical prefilter to collect large particles and a mechanical after-filter to collect agglomerated particles that may be blown off the electrostatic filter. An electrostatic filter electrically charges particles passing through an ionizing field and collects the charged particles on plates with an opposite electrical charge. The plates may be coated with an adhesive.