Features Organic Vapor and Acid Gases Approved for use against Organic Vapors and Acid Gases(Chlorine, Hydrogen Chloride, Sulfur Dioxide , Hydrogen Fluoride and Chloride Dioxide). 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 / Acid Gas (AG), Organic Vapor (OV) Color Code/ Yellow 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 Respirator Cartridge Type / Air Purifying Respirator Respirator Connection Type / Threaded Series / N Standards / NIOSH