Item Details MSA X-Large Filter Type HE Replacement Cartridge for OptimAir® 6A and MM PAPR's fits onto the motor/blower when the PAPR is used. Lightweight filter has an unrestricted air-inlet opening that helps to avoid gross debris from clogging the filter. It offers resistance to dusts, particles as well as mists and protects against a wide variety of contaminants. It is designed for easy installation, thread directly to the cartridge receptacles on comfo and other twin-cartridges respirators. Features Filter cartridges protect against dusts, particles and mists Designed for easy installation, thread directly to the cartridge receptacles on Comfo and other twin-cartridges respirators Specifications NIOSH APPROVED Product Attributes Safety Product Type » Filter Cartridge Assembly Respirator Series » Optimair PAPR » Show more details and specs