Comment from Larry Zacharias, (8/24/2017, 12:59 PM)
You correct answer is dead wrong unless the question specifically refers to the article in question, which the question did not. Many confined spaces have the potential for lighter than air toxins leaking from the system being coated or from chemical/biological residual deposits in the space. The geometry of the work space could also result in toxic materials rising/falling past the workspace. (A condition which resulted in a fatality on a job in my home town.) Unless you know exactly which toxins are involved in the confined space, no assumption should ever be made about where they will gather.
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