Designed for those who want maximum filter efficiency in a maintenance free respirator. Certified to provide at least 99.97% filter efficiency against solid and liquid particles (excluding those containing oil). Use this respirator when grinding, welding, working with lead, or situations where arsenic or cadmium are present up to 10X the OSHA PEL. Adjustable straps, a 3M™ Cool Flow™ exhalation valve, and a conformable faceseal make this a comfortable, durable respirator. Sold individually. Meets 42 CFR84 standard.