What is a Confined Space?

In terms of OSHA and NIOSH safety requirements, a “confined space” refers to an area whose enclosed environment and limited access make it dangerous to people working there. Anywhere access or egress is limited, or that may contain hazardous atmospheres (too low or enriched oxygen levels, toxic or flammable gases) will likely be classified as a confined space for workers. Confined spaces can be above or below ground level. Examples of confined spaces include inside airplane wings, tanks, pipes and sewers, ventilation shafts, electrical service rooms, vats, and silos.