Cartridge NIOSH Rating Ammonia (AM) Chlorine (CL) Chlorine Dioxide (CD) Formaldehyde (FM) Hydrogen Chloride (HC) Hydrogen Fluoride (HF) Hydrogen Sulfide (HS) Methylamine (MA) Organic Vapor (OV) Sulfur Dioxide (SD) Olive Compatible with Brand and Series MSA Comfo Twin-Cartridge Series Respirator Cartridge Type Air Purifying Respirator Respirator Connection Type Threaded Package Quantity 10