How is a confined space defined in terms of emergency response requirements?

A confined space is characterized by being large enough for a person to physically enter, but it also has limited means of entry and exit, which presents potential hazards. This definition is crucial in emergency response requirements because confined spaces can pose significant risks, such as toxic atmospheres, engulfment, or difficulties in rescue operations due to their design.

In the context of emergency response, recognizing a space as a confined space prompts specific protocols and safety measures to be adopted before entering. These procedures include atmospheric testing, the use of appropriate personal protective equipment, and the availability of rescue plans. The emphasis on physical entry underscores the necessity for responders to assess and mitigate potential dangers before committing personnel to such environments.