Reply #245: I was just saying that there are vents for air circulation.

[Make7]

What is being ejected could be a number of things, but seeing as how it's happening on a mechanical floor it could be dust that has gotten into the building air handling system. Or it could be part of the floors internally collapsing before the collapse of the perimeter walls. Or dust coming down the elevator shafts. Or.....

It might be localized to the middle of that face because that's where the air handling system is, or there is heavy machinery blocking the path from the elevator shafts except for at that particular point, or maybe there was a partial floor collapse right there.

I really don't know what is causing it to happen. I don't know that anyone really does, we can't see what's happening inside the building.

To tell you the truth, I haven't looked into it that much, but I seem to recall seeing "venting" on floors other than the mechanical floors.

Once again, there is no footage of the inside of the building at the impact area, so we can't really know how many columns were destroyed. 10 seems a little high to me, but no one can say for certain. It may actually have been more. I do believe that the plane took out the corner core column, which is significant because the corner columns share a larger portion of the load per column than any of the other columns.
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You've read the NIST report right? In their modeling, did they factor in the load the wind would put on the buildings?

-Make7