Problem Solving Forum
Problem Solving Forum: How to Set Up Ventilation in Confined Spaces

From JPCL, September 2009

How do you set up ventilation equipment for worker protection where access is difficult, such as manholes?...
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Tagged categories: Confined space; Environmental Controls; Health and safety; Manholes; Tanks and vessels; Ventilation

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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