a. A filter self-rescuer (FSR) is a respiratory protective device that filters ambient air of carbon monoxide, converting it to carbon dioxide. Exhaled air is vented back to ambient. Also called a gas mask. Duration of protection is limited, usually, by water contamination of the chemical bed. Used for escape from underground mines in the event of a fire or explosion. Requirement specified in 30 CFR 75.1714-2(e)(2). Apparatus must be certified as providing at least one hour of respiratory protection. Apparatus available in the United States are the Draeger 910 and the MSA W-65, both certified for one hour.
b. A self-contained self-rescuer (SCSR) is a respiratory protective device that provides breathing gas independent of the ambient atmosphere, containing its own oxygen source. Also called an oxygen self-rescuer. Air is exchanged between the user's lungs and a breathing bag. Oxygen consumed by the user is replaced by the apparatus from its oxygen source, stored either in chemical or compressed form. Carbon dioxide produced by the user is removed by a chemical absorbent in the apparatus breathing circuit. Duration of protection is determined by both quantity of stored oxygen and carbon dioxide absorption capacity. SCSRs differ from rescue breathing apparatus in that the breathing bag is not protected by a rigid cover in order to reduce size and weight. Used for escape from underground mines in the event of a fire or explosion. Requirement specified in 30 CFR 75.1714. Apparatus must be certified as providing at least one hour of respiratory protection. Apparatus available in the United States are the CSE SR-100, the Draeger OXY K plus, the MSA Portal-Pack, the Ocenco EBA 6.5, all certified for one hour.
c. A rescue breathing apparatus (RBA) is a respiratory protective device that provides breathing gas independent of the ambient atmosphere, containing its own oxygen source. Air is exchanged between the user's lungs and a breathing bag. Oxygen consumed by the user is replaced by the apparatus from its oxygen source, stored in compressed form in most apparatus. Carbon dioxide produced by the user is removed by a chemical absorbent in the apparatus breathing circuit. Duration of protection is determined by both quantity of stored oxygen and carbon dioxide absorption capacity. RBAs differ from self-contained self-rescuers in that the breathing bag is protected by a rigid cover in order to prevent accidental puncture or tear. Used for entry into underground mines after a fire or explosion in order to reestablish the ventilation system, rescue trapped miners, and put out fires. Requirement specified in 30 CFR 49.1. Apparatus must be certified as providing at least two hours of respiratory protection. Apparatus available in the United States are the Biomarine BioPak 240 and the Draeger BG-174A, both certified for four hours.
Source:
Dictionary of Mining, Mineral, and Related Terms












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