Certified under NIOSH 42CFR84 to provide at least 95% filter efficiency against particulate aerosols free of oil. Suggested applications include hot/ humid/dusty environments, welding, soldering, brazing, grinding, sanding, sweeping, bagging, cement, stone quarrying, torch cutting, metal pouring, polishing, buffing, poultry, metal machining, underground mining, textiles. Moldex exclusive Dura-Mesh shell stands up to most hot/humid conditions without collapsing. Flame-retardants added to shell to help decrease flammability. Exhalation valve reduces hot-air build up, making it cooler and more comfortable to wear. Contoured nose bridge seals easily without a metal noseband. 10 per box.