Which of the following is considered a confined space?

• A. Grain hopper
• B. Open field
• C. Stairwell with multiple exits
• D. Elevator lobbies

Answer: (A)

A confined space is a place with limited entry and exit that isn’t designed for people to work in regularly, and it may contain hazardous conditions. A grain hopper fits this: it has a small opening and is not a space intended for ongoing occupancy, yet working inside can expose you to hazards like engulfment from moving grain and potentially hazardous atmospheres (oxygen levels or dust combustion risks). Because of these risks, entering a grain hopper typically requires confined-space controls and permits, along with atmospheric testing and rescue planning. The other options don’t have the restricted-entry condition or aren’t spaces meant for entry and ongoing work: an open field has ample space and ventilation; a stairwell with multiple exits is a route for egress, not a space meant for work inside; elevator lobbies are open public areas.