Many masks come with a filter built-in or as a replaceable feature. You can also buy filters separately and insert them into face masks that allow for it. Equipping a face mask with a filter should increase its effectiveness in filtering out particulate.
There are different types of face mask filters, ranging from basic pieces of cloth to carbon filters and HEPA filters. Face mask filters will typically sit in between the two outer layers of the mask, and are used to further filter out particulate in the air.
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