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See Chinese contents: GB 21976.7-2012 GB 21976.7-2012: Escape apparatus for building fire -- Part 7: Filtering respiratory protective devices for self-rescue from fire
This part of GB 21976 specifies the type, model, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, other requirements of the filtering respiratory protective devices for self-rescue from fire. This part applies to the disposable filtering respiratory protective devices for self-rescue from fire worn by personnel when they are in a place where the oxygen concentration in the air is not less than 17% in the event of a fire.
