NIOSH certified to provide at least 95% filter efficiency against particulate contaminants free of oil. 3m #8214 respirator is specifically designed for welding and other metal fume applications involving ozone or nuisance level odors. Well suited to maintenance welding operations, torch cutting, brazing, soldering, and the pouring of metal. 3M Cool Flow exhalation valve creates easy breathing. Adjustable straps and a conformable face-seal provide a secure fit across a broad range of face sizes. Cake resistant filter material enables the worker to breathe easier over long periods of wear. Layers of carbon trap nuisance level odors and ozone up to 10 times the OSHA PEL. 10 per package.