Filter P1 R 5911The P1 R filter is designed to protect against low levels of airborne particles, including fine dust and water/oil-based mists. It is compatible with all 3M half and full-face masks that use a bayonet connection.Filter class – P1 RFilter type – for particulate matterAdditional InformationThe filters can help reduce inhalation of a wide range of dust, mists, and other particles, including certain airborne biological particles.