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What kinds of main workplaces are confined spaces?

Sewer tanks, pits, wells, manholes, culvert, drains, underground pipes, silos, liquid waste process tanks and vessels, grain warehouse, fermentation tanks, manure storage (fruit and vegetable storages, fungi growing), in-use underground vaults or warehouses, landfills, sedimentation tanks, decomposition pools, furnaces, underground surveillance room, and equipment in factory such as dust collectors, separation tanks, shredders, water scrubbing tower for chimney, pressure containers, boilers, reactor tanks, freezers, storage tanks, waste water process pool, waste liquid storage (iron or wood debris) or other internal compartments or workplaces where gases that deplete oxygen or are toxic are produced.