This respirator is well suited for those who want NIOSH's highest rated filtration efficiency in a maintenance-free respirator. Adjustable straps, Cool Flow exhalation valve, and a comfortable face seal make this a durable respirator. Provides minimum filtration efficiency of 99.97% against solid and liquid particles that do not contain oil. Meets NIOSH 42 CFR 84 N100 requirements (TC-84A-1298). (3M 8233) Caution: All 3M products must be used in accordance with OSHA regulations and the user instructions, warnings, and limitations accompanying each product. Respirators are individually packaged.