Of all the workplace hazards, confined spaces are some of the most deceptive. What looks like a "normal" space could be a deathtrap: filled with hazardous gases or, just as likely, lacking in oxygen.
Four minutes is all it takes for a confined space "rescue" to turn into a "body retrieval" exercise. After only four minutes without oxygen, it highly is likely that a worker who is not wearing a respirator will experience brain damage or death.
from Safety http://ift.tt/2rRi7xO
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