These filters and cartridges are compatible with Honeywell North 5400, 5500, 7600, and 7700 reusable respirators. - Particulate filters and vapor cartridges are NIOSH-rated and installed in reusable half-mask or full-face respirators to filter out airborne contaminants. - They are selected based on the environment and type of respiratory hazards that need to be filtered. - They can be changed out when they become dirty or when the type of contaminant changes. - Filters and cartridges are compatible with a specific brand and mask model. 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), P100, Sulfur Dioxide (SD) Color Code / Magenta, Olive Compatible with Brand and Series / Honeywell North 5400 Series, Honeywell North 5500 Series, Honeywell North 7600 Series, Honeywell North 7700 Series, Honeywell North RU6500 Series, Honeywell North RU8500 Series Respirator Cartridge Type / Air Purifying Respirator Respirator Connection Type / Threaded Series / N Standards / NIOSH