This respirator is designed for use when working with molten metals, including welding on galvanized and stainless steel. Fits easily under a welding hood. Certified to provide at least 95% efficiency at removing solid and liquid particles (excluding those containing oil). Adjustable straps, face seal, and 3M™ Cool Flow™ Exhalation Valve provide added comfort and durability. 10 per box. Meets 42 CFR84 standard.