Quote Originally Posted by werther
Since this film sets out to describe in detail the construction of the towers and how this construction made it 'impossible' for the towers to be felled by fire, I think they should bring up how it was designed not to allow fire to backdraft down the core shafts. I can't remember where I read this, I would like to provide a link. dammit can't find it!
I remember reading this too. The towers were basically in three sections, the cores had some type of fire door separating each section that would prevent the core from becoming a chimney in the event of a fire. I would assume this would also work in reverse, preventing a blast of fire from blowing down the core.