FILTER 3M 2091 P100|3M’s 2091 filter is a P100 particulate filter that is NIOSH-approved for environments containing certain oil and non-oil based particles. It should be used with 5000 or 6000 respirator series with a 502 adapter, or the 6000 facepiece, or the 7000 facepiece with bayonet filter holder. NOTE: Do not use in environments that are immediately dangerous to life or health.