Enclosed space includes which of the following?

• A. Cofferdam
• B. Scrubber
• C. All of the above
• D. Deck seal

Answer: (C)

Enclosed spaces are areas that are largely surrounded by solid boundaries and have limited means of entry, which means they can trap hazardous atmospheres if not properly tested and ventilated. Cofferdams fit this since they are spaces bounded by walls and decks used to keep water out of a work area, with restricted access. A scrubber is a closed processing unit for exhaust gases, built as a contained space with limited entry points where gases can accumulate if ventilation isn’t managed. A deck seal forms a sealed or semi-sealed enclosure around deck penetrations or equipment, creating a space that isn’t freely ventilated and can harbor hazardous air during maintenance. Because each of these involves restricted access and potential atmospheric hazards, they all qualify as enclosed spaces. Hence, all of the above is the best answer.