A confined space is any space that is large enough for an employee to enter, has a restricted means of entry or exit, and is not designed for continuous employee occupancy.

Examples of confined spaces include tanks, pits, certain tunnels, utility vaults, and boilers. The physical and atmospheric hazards often associated with confined spaces can cause serious injury or death to workers.

A comprehensive confined space entry program is required in order to ensure the safety of employees who must enter and work in confined spaces.