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The 8511 is a 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. The disposable particulate respirator is designed to help provide reliable respiratory protection of at least 95% filtration efficiency against certain non-oil based particles. The respirator is designed for use for particles such as those from grinding, sanding, sweeping, sawing, bagging or other dusty operations. This respirator can also help reduce inhalation exposures to certain airborne biological particles (examples: mold, Bacillus anthracis, Mycobacterium tuberculosis), but cannot eliminate the risk of contracting infection, illness or disease. Soft inner material provides added comfort while the cup shape design makes the respirator spacious and durable.