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We often see on the road construction workers in the manhole construction, but we often don’t know is, this is a limitation of space operations work. Hence, due to space limitations, not proper air circulation, temperature and closed operation, it often has some poison gas at those construction sites. Although, many news report on the incident, there is often confined space operations, but still on average a year, nine people will died doing this kind of disaster, is rank first in its field, but most company or peoples don’t paid much attention about it.
Southern Taiwan University of Science and Technology