For 3M Adflo Powered Air Purifying Respirator. The Adflo OV/SD/CL/HC cartridge can be “stacked” onto the High Efficiency particulate filter for additional protection against organic, sulfur dioxide, chlorine and hydrogen chloride vapors.
3M Adflo Replacement Cartridges 15-0499-99X02, Organic Vapor/Acid Gas(OV/SD/CL/HC) (Single Case with 2 Cartridges) Review