หน้ากากกรองฝุ่น 3M 8511 This disposable N95 particulate respirator features the proprietary 3M™ Cool Flow™ Valve and helps provide comfortable, reliable worker respiratory protection. It is ideally suited for hot/dusty work settings that require long periods of wear. Benefits 3M™ CoolFlow™ Valve Adjustable M nose clip Braided head bands and soft inner materials Spacious and durable Designed to increase comfort and wearability