An atmosphere-supplying respirator that supplies a respirable air atmosphere to the user from a breathing air source that is independent of the ambient environment and designed to be carried by the user, (see figure s. 3). Note: Where the term self-contained breathing apparatus is used without any qualifier, it indicates only open-circuit self-contained breathing apparatus or combination SCBA/ SARs. Combination SCBA/SARs are encompassed by the terms self-contained breathing apparatus or SCBA. N F PA 1981, 2002 ed