Please See Title or Description for Package Qty. Particulate respirator without valve. Soft foam nose cushion for added comfort. Filter classification: N (non-oil particulates). Suspension: 2-strap. Dura-mesh shell resists collapsing in heat and humidity. NIOSH approved. Filter efficiency: 95. Meets heat and flame resistance in accordance with ANSI/ISEA 110-2003 section 7.11.1. 20 per box. 2200 series. 9 1/2'(H) x 5 1/5'(W) x 5 1/5'(L). Molded nose bridge seals easily without a metal noseband. Size: Medium/large. Recommended for 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.