Respiratory protective devices - Compressed air line breathing apparatus for use with a full face mask, halfmask or a mouthpiece assembly - Requirements, testing, marking.
呼吸保护装置。与全罩式面罩、半罩式面罩或口罩一起使用的压缩空气导管呼吸装置。要求、试验和标志。
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Depending on the chemical or biological agents in the environment, a halfmask may not be sufficient because the eyes are very sensitive to chemicals and offer an easy entry point for bacteria.