A space that meets the definition of a confined space and contains other recognized serious safety and health hazards is a permit-required confined space.
A health hazard is defined as a substance for which there is statistically substantial evidence from at least one study carried out in accordance with recognized scientific principles indicating acute or chronic health impacts may develop in exposed workers.
OSHA defines a chemical as a health hazard if it has the potential to result in any of the following adverse health effects: acute toxicity (any route of exposure), skin corrosion or irritation. A confined place that requires a permit is one that satisfies the definition of a confined space and has additional known substantial safety and health hazards.
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