NIOSH-rated particulate filters and respirator cartridges, including combination cartridges, are designed to be used with full and half face piece respirators for protection against airborne contaminants. Different particulate filters or cartridges, or combination cartridges, are used depending on the specific airborne hazards the wearer is being exposed to. It is therefore critical to select the appropriate filter or cartridge for your specific application as well as to switch your filter or cartridge as the atmospheric conditions warrant. As their service life is limited is nature, it is equally important to discard and replace your filters and cartridges when they become dirty. We offer a huge selection of NIOSH-rated respirator filters and cartridges at great prices from the most well-known and trusted brands in the industry, including Honeywell North, 3M, and MSA. Have any questions? Please call to speak with one of our knowledgeable staff members at 1-800-543-4592 or email today!