Which of the following statements is true about confined spaces?

Confined spaces are defined by a combination of their physical characteristics and potential hazards. The statement regarding the potential to contain a hazardous atmosphere is accurate because confined spaces—such as tanks, silos, and sewers—often lack adequate ventilation, leading to the accumulation of harmful gases, vapors, or insufficient oxygen levels. This inherent risk necessitates the need for proper monitoring and safety protocols when entering such environments.

In contrast, the other statements do not appropriately describe the nature of confined spaces. They are not typically well-ventilated; rather, many have limited airflow, which can exacerbate the hazards. Entry and exit are often challenging due to physical constraints, and they are not usually designed for continual work, as many are intended for maintenance or inspection activities rather than ongoing operations.