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What are confined space signs? Confined space signs simply warn people that an area is considered a confined space. A Confined spaces is large enough for a person to enter, but have restricted means of exit. This might be a tank, a tunnel, a sewer or some other industrial space. There is usually only one restrictive (smaller than a doorway) way in or out, and it is not designed for continuous occupancy. Lack of adequate ventilation also plays a factor. Why are they necessary? Confine …