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Over ten years ago 3M developed the revolutionary 9300 series disposable particulate respirator to help protect the respiratory health of people exposed to particulate hazards in the workplace such as dusts, mists and metal fume. Today, the 9300 series combines 3M’s own patented technologies to offer state-of-the-art protection and a cutting edge design for maximum performance, comfort and usability. The 3M Advanced Electret Filter Material combines the benefits of both mechanical and electrostatic filters. This means lower breathing resistance coupled with excellent quality. The 3M Cool Flow Valve allows exhaled air to escape more easily – particularly beneficial in hot and humid conditions – meaning the respirator is comfortable to wear even after long periods of time.