2-pack. 3M 8233. For dusty conditions and nuisance odors. Adjustable straps, Cool Flow exhalation valve and face seal. Form-fitting nose piece for custom fit and secure seal. Fits a wide range of faces and shapes. Appropriate for use where HEPA was previously required. NIOSH approved. Minimum 99.97% filter efficient. Protection from lead, arsenic, cadmium, welding, pharmaceutical manufacturing and more, excluding those with oil. HEPA seal blocks influenza, TB, SARS, and Anthrax.