Ventilation System Design basis?

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We do a lot of work in flammable atmospheres so yes we have rather high standards for what “minimal compliance” looks like.  We recently came across this situation while performing an assessment for a facility that has suffered from a flash fire months earlier.  During our walk-thru of the area (they knew we were coming) we walked upon this situation.  As I stopped and began to make a note, the unit manager asked if I saw something.  As I began to point out the issue, the “safety person” (e.g. one of those “safety is common sense” type managers) chimed in and asked, “how do you know that pick-up point is obstructed”?  Obviously, he saw the exact same thing I was seeing.  Here is the picture of what was presented to us in our walk-thru and I ask you, is this ventilation pick up point:

A. Blocked
or
B. “It depends”

My response may surprise you…

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