| http://www.w3.org/ns/prov#value | - at least one undesirable material such as at least one of microorganisms (e.g., bacteria), viruses, cells, body fluids, particulates, aerosols and liquid droplets, and allows at least a portion of the gas to pass through the retentive element, wherein the gas is depleted of at least some level of the undesirable material(s) as the gas passes through the filter.
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