This standard provides minimum safety requirements to be followed while entering, exiting and working in confined spaces at normal atmospheric pressure.
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The American Society of Safety Engineers [asse]
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As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.
