There may be two filters on your vacuum: one for intake, and one for exhaust. Filters ensure that your motor does not get damaged, that all the dirt and debris stays within your vacuum, and special filters (like HEPA) can clean microparticles from the air itself. Depending on your vacuum needs and the model of your unit, you may need several different kinds of filters.
Some vacuums come with lifetime filters, and require special cleaning.
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