A confined space is a space with limited entry and egress and not suitable for human inhabitants.
A confined space varies between jurisdictions, it is generally recognized as a space that:
• has limited or restricted means of entry or exit;
• is large enough for a person to enter to perform tasks;
• is not designed or configured for continuous occupancy
Hazards in a confined space often include harmful dust or gases, asphyxiation, oxygen level limited, submersion in liquids or solids, electrocution, or entrapment.

Before entering a confined space, a trained safety professional must test the internal atmosphere for oxygen, flammable gases, vapors and potential air contaminants.
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