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Understanding the Breathing Gas Capacities (ratings) of Escape Respirators for Mineworker Use

May 2013
DHHS (NIOSH) Publication Number 2013-148
Miner wearing CCER (closed-circuit escape respirator)

The following information will help workers understand the meaning of breathing gas capacity of a jointly approved National Institute for Occupational Safety and Health (NIOSH) and Mine Safety and Health Administration (MSHA) closed-circuit escape respirator (CCER). Understanding the uses and limitations of the CCER is important in planning for an escape during a mine emergency.