[SlickWillard]

The buildings had no sprinklers, because each floor could be sealed off from the others in case of a fire. "There are shutters that would shut off the vertical openings [between floors] so that the fire couldn't travel from one floor to the other. That was the theory. When the danger had subsided they could evacuate."

If this is true, there could be tens of thousands dead.

[Fred Hayek]

No sprinklers? Don't think so. I worked at 2 WTC, 89th floor, in 1984 and 1985 (Ebasco, now owned by Raytheon).