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The simple definition of a confined space is an area that is large enough for a worker to enter and work, but that is tough to get in and out of and isn’t designed for regular occupancy. With a definition like that, there are so many spaces that would qualify - under the sink, an attic crawl space, the shed that houses an air compressor. While all of them qualify as a confined space, not all of them will be classified as a permit-required confined space (PRCS). OSHA has copious files re …