Abstract
The Bureau of Mines tests and approves respiratory protective devices according to performance requirements set forth in pertinent approval schedules. Changes in industrial technology and respirator application require review and revision of these performance requirements. Revisions are accomplished through cooperative efforts of the Bureau of Mines, the manufacturers, and the users of respiratory protective devices. The requirements of recently revised Schedule 21B for dust, fume, and mist respirators are discussed, as well as requirements proposed for inclusion in revisions of approval schedules for other types of respiratory protective devices.

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