Comment: The fires in the building before the collapse

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The fires in the building before the collapse

were inefficient and transient (see all the smoke). The steel that was initially heated from burning jet fuel (basically kerosene) and later office furnishings was connected to other steel creating a giant heat sink conducting heat away from the source.

According to NIST, the paint deformation tests conducted on steel samples known to be from the fire zones showed no indication of temperatures above 250C or 500F.