Half Mask Respirator Kit Rugged Comfort 6500 Series L Includes (4) 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 (S