Particulate Respirator with exhale valve reduces hot air build-up and keeps workers cooler. urea-Mesh shell resists collapsing in heat and humidity. Molded nose bridge seals easily without a metal nose band. Naturally contoured face piece with foam nose flange relieves pressure points. Soft spun lining gives added comfort and durability. Available in three sizes to fit most faces. Flame retardants are added to the shell to help decrease flammability. NIOSH certified to have a filter efficiency level of 95% or greater against particulate aerosols free of oil. Hot, humid and dusty environments such as welding, soldering and brazing, grinding, sanding, sweeping, bagging, stone quarrying, metal machining, cement, underground mining, polishing, buffing, lime, poultry and textiles.