|Many workplaces contain spaces that are considered to be "confined"
because their configurations hinder the activities of employees who must enter into, work
in, and exit from them.
In many instances, employees who work in confined spaces also face increased risk of exposure to serious physical injury from hazards such as entrapment, engulfment, and hazardous atmospheric conditions.
Confinement itself may pose entrapment hazards. Work in confined spaces may keep employees closer to hazards (such as an asphyxiating atmosphere) than there would be otherwise. For example, confinement, limited access, and restricted airflow can result in hazardous conditions that would not arise in an open workplace.
The term "permit-required confined space" (i.e., permit space) refers to those spaces that meet the definition of a "confined space" and pose health or safety hazards, thereby requiring a permit for entry.