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Some confined spaces just aren't fit to breath in. Respiratory protection, whether for work in a space with Immediate Danger to Life and Health (IDLH) or in a rescue operation where air filtering or purifying respirators are not an option, has two critical requirements: First, it must provide a clean air supply. Secondly, it cannot interfere with safe entry and exit from the space. The two types of breathing devices that fit these requirements are a self-contained breathing apparatus (SCBA …