HEPA filter
HEPA stands for High-Efficiency Particulate Air. It is a type of air filter whose dense network of randomly arranged fibers mechanically traps very small impurities. To be designated as a HEPA filter, it must, according to standard, filter out at least 99.97% of solid particles with a size of 0.3 micrometers, which is a thousandth of a millimeter. Such particles include, for example, dust, pollen, mold spores, dust mites, or animal allergens. In a vacuum cleaner, it is placed at the outlet, thus cleaning the air that returns to the room after vacuuming. Filters can be washable, which can be reused after washing and thorough drying, or disposable, which need to be replaced with new ones after a certain period.
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