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The 3M Cartridge FR-C2A1 is designed to reduce exposure to chemical and biological warfare agents. Used by the United States Military. NIOSH approved with the 3M™ Full Facepiece Respirator FR-M40 for sulfur dioxide, chlorine, hydrogen chloride, CN, CS and P100 particulate.Contains both a carbon bed and particulate filter.Designed to help provide respiratory protection against certain airborne contaminants when used in accordance with all use and limitation instructions and applicable safety and health regulations. Note: There is currently no NIOSH-approval schedule for negative pressure respirators used against chemical or biological warfare agents.